28463401521 has 9 divisors (see below), whose sum is σ = 41114533291. Its totient is φ = 18975263592.

The previous prime is 28463401511. The next prime is 28463401559. The reversal of 28463401521 is 12510436482.

It is a happy number.

The square root of 28463401521 is 168711.

It is a perfect power (a square), and thus also a powerful number.

28463401521 is a `hidden beast` number, since 2 + 8 + 4 + 634 + 0 + 15 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15459192225 + 13004209296 = 124335^2 + 114036^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-28463401521 is a prime.

It is a super-2 number, since 2×28463401521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28463401511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 478015 + ... + 534251.

Almost surely, 2^28463401521 is an apocalyptic number.

28463401521 is the 168711-st square number.

28463401521 is the 84356-th centered octagonal number.

It is an amenable number.

28463401521 is a deficient number, since it is larger than the sum of its proper divisors (12651131770).

28463401521 is an frugal number, since it uses more digits than its factorization.

28463401521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112480 (or 56240 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Multiplying 28463401521 by its sum of digits (36), we get a square (1024682454756 = 1012266²).

The spelling of 28463401521 in words is "twenty-eight billion, four hundred sixty-three million, four hundred one thousand, five hundred twenty-one".