78777320 has 32 divisors (see below), whose sum is σ = 187677000. Its totient is φ = 29657088.

The previous prime is 78777317. The next prime is 78777341. The reversal of 78777320 is 2377787.

It can be written as a sum of positive squares in 4 ways, for example, as 77123524 + 1653796 = 8782^2 + 1286^2 .

It is a super-2 number, since 2×78777320² = 12411732292764800, which contains 22 as substring.

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, 57245 + ... + 58604.

Almost surely, 2^78777320 is an apocalyptic number.

It is an amenable number.

78777320 is an abundant number, since it is smaller than the sum of its proper divisors (108899680).

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

78777320 is a wasteful number, since it uses less digits than its factorization.

78777320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115877 (or 115873 counting only the distinct ones).

The product of its (nonzero) digits is 115248, while the sum is 41.

The square root of 78777320 is about 8875.6588487841. The cubic root of 78777320 is about 428.6805053579.

It can be divided in two parts, 78777 and 320, that added together give a palindrome (79097).

The spelling of 78777320 in words is "seventy-eight million, seven hundred seventy-seven thousand, three hundred twenty".