78672890 has 16 divisors (see below), whose sum is σ = 141817608. Its totient is φ = 31423296.

The previous prime is 78672883. The next prime is 78672943. The reversal of 78672890 is 9827687.

It can be written as a sum of positive squares in 4 ways, for example, as 67092481 + 11580409 = 8191^2 + 3403^2 .

It is a Curzon 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, 1964 + ... + 12696.

Almost surely, 2^78672890 is an apocalyptic number.

78672890 is a deficient number, since it is larger than the sum of its proper divisors (63144718).

78672890 is a wasteful number, since it uses less digits than its factorization.

78672890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11473.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 78672890 is about 8869.7739542787. The cubic root of 78672890 is about 428.4909969166.

The spelling of 78672890 in words is "seventy-eight million, six hundred seventy-two thousand, eight hundred ninety".