77055520 has 48 divisors (see below), whose sum is σ = 189967680. Its totient is φ = 29480704.

The previous prime is 77055493. The next prime is 77055533. The reversal of 77055520 is 2555077.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6790 + ... + 14149.

It is an arithmetic number, because the mean of its divisors is an integer number (3957660).

Almost surely, 2^77055520 is an apocalyptic number.

It is an amenable number.

77055520 is an abundant number, since it is smaller than the sum of its proper divisors (112912160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77055520 is a wasteful number, since it uses less digits than its factorization.

77055520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20977 (or 20969 counting only the distinct ones).

The product of its (nonzero) digits is 12250, while the sum is 31.

The square root of 77055520 is about 8778.1273629402. The cubic root of 77055520 is about 425.5343129822.

It can be divided in two parts, 7705 and 5520, that added together give a square (13225 = 115²).

The spelling of 77055520 in words is "seventy-seven million, fifty-five thousand, five hundred twenty".