77401560 has 32 divisors (see below), whose sum is σ = 232205040. Its totient is φ = 20640384.

The previous prime is 77401537. The next prime is 77401579. The reversal of 77401560 is 6510477.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 7 ways as a sum of consecutive naturals, for example, 322387 + ... + 322626.

Almost surely, 2^77401560 is an apocalyptic number.

It is an amenable number.

77401560 is an abundant number, since it is smaller than the sum of its proper divisors (154803480).

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

77401560 is a wasteful number, since it uses less digits than its factorization.

77401560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645027 (or 645023 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 77401560 is about 8797.8156379865. The cubic root of 77401560 is about 426.1703566050.

The spelling of 77401560 in words is "seventy-seven million, four hundred one thousand, five hundred sixty".