97776987 has 16 divisors (see below), whose sum is σ = 162538752. Its totient is φ = 50793120.

The previous prime is 97776971. The next prime is 97777019. The reversal of 97776987 is 78967779.

It is not a de Polignac number, because 97776987 - 2⁴ = 97776971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97776987.

It is not an unprimeable number, because it can be changed into a prime (97776187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211408 + ... + 211869.

It is an arithmetic number, because the mean of its divisors is an integer number (10158672).

Almost surely, 2^97776987 is an apocalyptic number.

97776987 is a deficient number, since it is larger than the sum of its proper divisors (64761765).

97776987 is a wasteful number, since it uses less digits than its factorization.

97776987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423298.

The product of its digits is 9335088, while the sum is 60.

The square root of 97776987 is about 9888.2246637099. The cubic root of 97776987 is about 460.6936400408.

The spelling of 97776987 in words is "ninety-seven million, seven hundred seventy-six thousand, nine hundred eighty-seven".