77691480 has 32 divisors (see below), whose sum is σ = 233074800. Its totient is φ = 20717696.

The previous prime is 77691473. The next prime is 77691499. The reversal of 77691480 is 8419677.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323595 + ... + 323834.

Almost surely, 2^77691480 is an apocalyptic number.

It is an amenable number.

77691480 is an abundant number, since it is smaller than the sum of its proper divisors (155383320).

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

77691480 is a wasteful number, since it uses less digits than its factorization.

77691480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647443 (or 647439 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 77691480 is about 8814.2770548696. The cubic root of 77691480 is about 426.7017901858.

The spelling of 77691480 in words is "seventy-seven million, six hundred ninety-one thousand, four hundred eighty".