64239437025 has 81 divisors (see below), whose sum is σ = 117400944843. Its totient is φ = 33577718400.

The previous prime is 64239436979. The next prime is 64239437047. The reversal of 64239437025 is 52073493246.

The square root of 64239437025 is 253455.

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

64239437025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 13 ways, for example, as 57964896081 + 6274540944 = 240759^2 + 79212^2 .

It is not a de Polignac number, because 64239437025 - 2¹¹ = 64239434977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 231911187 + ... + 231911463.

Almost surely, 2^64239437025 is an apocalyptic number.

64239437025 is the 253455-th square number.

64239437025 is the 126728-th centered octagonal number.

It is an amenable number.

64239437025 is a deficient number, since it is larger than the sum of its proper divisors (53161507818).

64239437025 is an equidigital number, since it uses as much as digits as its factorization.

64239437025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 45.

It can be divided in two parts, 64239 and 437025, that added together give a square (501264 = 708²).

The spelling of 64239437025 in words is "sixty-four billion, two hundred thirty-nine million, four hundred thirty-seven thousand, twenty-five".