77816997 has 8 divisors (see below), whose sum is σ = 115284480. Its totient is φ = 51877980.

The previous prime is 77816993. The next prime is 77817001. The reversal of 77816997 is 79961877.

It is an interprime number because it is at equal distance from previous prime (77816993) and next prime (77817001).

It is not a de Polignac number, because 77816997 - 2² = 77816993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77816993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1441029 + ... + 1441082.

It is an arithmetic number, because the mean of its divisors is an integer number (14410560).

Almost surely, 2^77816997 is an apocalyptic number.

It is an amenable number.

77816997 is a deficient number, since it is larger than the sum of its proper divisors (37467483).

77816997 is a wasteful number, since it uses less digits than its factorization.

77816997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882120 (or 2882114 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 54.

The square root of 77816997 is about 8821.3942775505. The cubic root of 77816997 is about 426.9314572047.

The spelling of 77816997 in words is "seventy-seven million, eight hundred sixteen thousand, nine hundred ninety-seven".