77520231 has 12 divisors (see below), whose sum is σ = 112646352. Its totient is φ = 51369696.

The previous prime is 77520211. The next prime is 77520239. The reversal of 77520231 is 13202577.

It is not a de Polignac number, because 77520231 - 2⁵ = 77520199 is a prime.

It is a super-2 number, since 2×77520231² = 12018772428586722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77520195 and 77520204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77520239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24286 + ... + 27291.

It is an arithmetic number, because the mean of its divisors is an integer number (9387196).

Almost surely, 2^77520231 is an apocalyptic number.

77520231 is a deficient number, since it is larger than the sum of its proper divisors (35126121).

77520231 is a wasteful number, since it uses less digits than its factorization.

77520231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51750 (or 51747 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 77520231 is about 8804.5573994381. The cubic root of 77520231 is about 426.3880448871.

It can be divided in two parts, 77520 and 231, that multiplied together give a triangular number (17907120 = T₅₉₈₄).

The spelling of 77520231 in words is "seventy-seven million, five hundred twenty thousand, two hundred thirty-one".