77355980 has 24 divisors (see below), whose sum is σ = 174944112. Its totient is φ = 28562112.

The previous prime is 77355979. The next prime is 77355997. The reversal of 77355980 is 8955377.

It is a happy 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, 148502 + ... + 149021.

It is an arithmetic number, because the mean of its divisors is an integer number (7289338).

Almost surely, 2^77355980 is an apocalyptic number.

It is an amenable number.

77355980 is an abundant number, since it is smaller than the sum of its proper divisors (97588132).

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

77355980 is a wasteful number, since it uses less digits than its factorization.

77355980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297545 (or 297543 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 77355980 is about 8795.2248407872. The cubic root of 77355980 is about 426.0866862024.

The spelling of 77355980 in words is "seventy-seven million, three hundred fifty-five thousand, nine hundred eighty".