28478763505 has 16 divisors (see below), whose sum is σ = 34264430784. Its totient is φ = 22723126720.

The previous prime is 28478763503. The next prime is 28478763563. The reversal of 28478763505 is 50536787482.

It is not a de Polignac number, because 28478763505 - 2¹ = 28478763503 is a prime.

It is a super-2 number, since 2×28478763505² (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 (28478763503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7257474 + ... + 7261396.

It is an arithmetic number, because the mean of its divisors is an integer number (2141526924).

Almost surely, 2^28478763505 is an apocalyptic number.

It is an amenable number.

28478763505 is a deficient number, since it is larger than the sum of its proper divisors (5785667279).

28478763505 is a wasteful number, since it uses less digits than its factorization.

28478763505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376.

The product of its (nonzero) digits is 11289600, while the sum is 55.

The spelling of 28478763505 in words is "twenty-eight billion, four hundred seventy-eight million, seven hundred sixty-three thousand, five hundred five".