78997455 has 24 divisors (see below), whose sum is σ = 141348480. Its totient is φ = 40772160.

The previous prime is 78997427. The next prime is 78997483. The reversal of 78997455 is 55479987.

It is an interprime number because it is at equal distance from previous prime (78997427) and next prime (78997483).

It is not a de Polignac number, because 78997455 - 2⁷ = 78997327 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26920 + ... + 29709.

It is an arithmetic number, because the mean of its divisors is an integer number (5889520).

Almost surely, 2^78997455 is an apocalyptic number.

78997455 is a deficient number, since it is larger than the sum of its proper divisors (62351025).

78997455 is a wasteful number, since it uses less digits than its factorization.

78997455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56671 (or 56668 counting only the distinct ones).

The product of its digits is 3175200, while the sum is 54.

The square root of 78997455 is about 8888.0512487271. The cubic root of 78997455 is about 429.0794349785.

The spelling of 78997455 in words is "seventy-eight million, nine hundred ninety-seven thousand, four hundred fifty-five".