82521025 has 24 divisors (see below), whose sum is σ = 104973440. Its totient is φ = 64333440.

The previous prime is 82521013. The next prime is 82521029. The reversal of 82521025 is 52012528.

It is not a de Polignac number, because 82521025 - 2⁵ = 82520993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (82521029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187756 + ... + 188194.

Almost surely, 2^82521025 is an apocalyptic number.

It is an amenable number.

82521025 is a deficient number, since it is larger than the sum of its proper divisors (22452415).

82521025 is a wasteful number, since it uses less digits than its factorization.

82521025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 82521025 is about 9084.1083767203. The cubic root of 82521025 is about 435.3663624290.

The spelling of 82521025 in words is "eighty-two million, five hundred twenty-one thousand, twenty-five".