77216525 has 24 divisors (see below), whose sum is σ = 97803264. Its totient is φ = 60465600.

The previous prime is 77216501. The next prime is 77216539. The reversal of 77216525 is 52561277.

It is a happy number.

It is not a de Polignac number, because 77216525 - 2¹⁴ = 77200141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 404180 + ... + 404370.

It is an arithmetic number, because the mean of its divisors is an integer number (4075136).

Almost surely, 2^77216525 is an apocalyptic number.

It is an amenable number.

77216525 is a deficient number, since it is larger than the sum of its proper divisors (20586739).

77216525 is a wasteful number, since it uses less digits than its factorization.

77216525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 456 counting only the distinct ones).

The product of its digits is 29400, while the sum is 35.

The square root of 77216525 is about 8787.2933830617. The cubic root of 77216525 is about 425.8304868264.

It can be divided in two parts, 77 and 216525, that multiplied together give a triangular number (16672425 = T₅₇₇₄).

The spelling of 77216525 in words is "seventy-seven million, two hundred sixteen thousand, five hundred twenty-five".