78279870 has 16 divisors (see below), whose sum is σ = 187871760. Its totient is φ = 20874624.

The previous prime is 78279853. The next prime is 78279881. The reversal of 78279870 is 7897287.

It is a super-2 number, since 2×78279870² = 12255476094433800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1304635 + ... + 1304694.

It is an arithmetic number, because the mean of its divisors is an integer number (11741985).

Almost surely, 2^78279870 is an apocalyptic number.

78279870 is an abundant number, since it is smaller than the sum of its proper divisors (109591890).

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

78279870 is a wasteful number, since it uses less digits than its factorization.

78279870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609339.

The product of its (nonzero) digits is 395136, while the sum is 48.

The square root of 78279870 is about 8847.5911976085. The cubic root of 78279870 is about 427.7762791250.

The spelling of 78279870 in words is "seventy-eight million, two hundred seventy-nine thousand, eight hundred seventy".