78970321 has 16 divisors (see below), whose sum is σ = 86413824. Its totient is φ = 71864064.

The previous prime is 78970313. The next prime is 78970351. The reversal of 78970321 is 12307987.

It is not a de Polignac number, because 78970321 - 2³ = 78970313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78970351) 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, 139986 + ... + 140548.

It is an arithmetic number, because the mean of its divisors is an integer number (5400864).

Almost surely, 2^78970321 is an apocalyptic number.

It is an amenable number.

78970321 is a deficient number, since it is larger than the sum of its proper divisors (7443503).

78970321 is a wasteful number, since it uses less digits than its factorization.

78970321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 78970321 is about 8886.5246862877. The cubic root of 78970321 is about 429.0303027010.

The spelling of 78970321 in words is "seventy-eight million, nine hundred seventy thousand, three hundred twenty-one".