97777720 has 32 divisors (see below), whose sum is σ = 227099520. Its totient is φ = 37848960.

The previous prime is 97777711. The next prime is 97777741. The reversal of 97777720 is 2777779.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 10.

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, 38187 + ... + 40666.

It is an arithmetic number, because the mean of its divisors is an integer number (7096860).

Almost surely, 2^97777720 is an apocalyptic number.

It is an amenable number.

97777720 is an abundant number, since it is smaller than the sum of its proper divisors (129321800).

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

97777720 is a wasteful number, since it uses less digits than its factorization.

97777720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78895 (or 78891 counting only the distinct ones).

The product of its (nonzero) digits is 302526, while the sum is 46.

The square root of 97777720 is about 9888.2617279277. The cubic root of 97777720 is about 460.6947912578.

The spelling of 97777720 in words is "ninety-seven million, seven hundred seventy-seven thousand, seven hundred twenty".