78997590 has 96 divisors (see below), whose sum is σ = 241151040. Its totient is φ = 17563392.

The previous prime is 78997577. The next prime is 78997603. The reversal of 78997590 is 9579987.

It is an interprime number because it is at equal distance from previous prime (78997577) and next prime (78997603).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21616 + ... + 25004.

It is an arithmetic number, because the mean of its divisors is an integer number (2511990).

Almost surely, 2^78997590 is an apocalyptic number.

78997590 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78997590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120575520).

78997590 is an abundant number, since it is smaller than the sum of its proper divisors (162153450).

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

78997590 is a wasteful number, since it uses less digits than its factorization.

78997590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3446 (or 3443 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The square root of 78997590 is about 8888.0588431896. The cubic root of 78997590 is about 429.0796793986.

The spelling of 78997590 in words is "seventy-eight million, nine hundred ninety-seven thousand, five hundred ninety".