77158920 has 128 divisors (see below), whose sum is σ = 248054400. Its totient is φ = 19132416.

The previous prime is 77158919. The next prime is 77158931. The reversal of 77158920 is 2985177.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222187 + ... + 222533.

It is an arithmetic number, because the mean of its divisors is an integer number (1937925).

Almost surely, 2^77158920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77158920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124027200).

77158920 is an abundant number, since it is smaller than the sum of its proper divisors (170895480).

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

77158920 is a wasteful number, since it uses less digits than its factorization.

77158920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 77158920 is about 8784.0150273096. The cubic root of 77158920 is about 425.7245679285.

The spelling of 77158920 in words is "seventy-seven million, one hundred fifty-eight thousand, nine hundred twenty".