23477287729 has 45 divisors (see below), whose sum is σ = 28396210283. Its totient is φ = 19409063856.

The previous prime is 23477287727. The next prime is 23477287733. The reversal of 23477287729 is 92778277432.

The square root of 23477287729 is 153223.

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

It can be written as a sum of positive squares in only one way, i.e., 16924709025 + 6552578704 = 130095^2 + 80948^2 .

It is not a de Polignac number, because 23477287729 - 2¹ = 23477287727 is a prime.

It is a super-2 number, since 2×23477287729² (a number of 22 digits) contains 22 as substring.

Its product of digits (16595712) is a multiple of the sum of its prime factors (252).

It is not an unprimeable number, because it can be changed into a prime (23477287723) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 397920102 + ... + 397920160.

Almost surely, 2^23477287729 is an apocalyptic number.

23477287729 is the 153223-rd square number.

23477287729 is the 76612-nd centered octagonal number.

It is an amenable number.

23477287729 is a deficient number, since it is larger than the sum of its proper divisors (4918922554).

23477287729 is an frugal number, since it uses more digits than its factorization.

23477287729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 119 counting only the distinct ones).

The product of its digits is 16595712, while the sum is 58.

The spelling of 23477287729 in words is "twenty-three billion, four hundred seventy-seven million, two hundred eighty-seven thousand, seven hundred twenty-nine".