77985580 has 12 divisors (see below), whose sum is σ = 163769760. Its totient is φ = 31194224.

The previous prime is 77985563. The next prime is 77985581. The reversal of 77985580 is 8558977.

It is not an unprimeable number, because it can be changed into a prime (77985581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1949620 + ... + 1949659.

It is an arithmetic number, because the mean of its divisors is an integer number (13647480).

Almost surely, 2^77985580 is an apocalyptic number.

It is an amenable number.

77985580 is an abundant number, since it is smaller than the sum of its proper divisors (85784180).

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

77985580 is a wasteful number, since it uses less digits than its factorization.

77985580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3899288 (or 3899286 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 77985580 is about 8830.9444568517. The cubic root of 77985580 is about 427.2395367444.

The spelling of 77985580 in words is "seventy-seven million, nine hundred eighty-five thousand, five hundred eighty".