78863870 has 16 divisors (see below), whose sum is σ = 149426640. Its totient is φ = 29885184.

The previous prime is 78863857. The next prime is 78863923. The reversal of 78863870 is 7836887.

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, 207347 + ... + 207726.

It is an arithmetic number, because the mean of its divisors is an integer number (9339165).

Almost surely, 2^78863870 is an apocalyptic number.

78863870 is a deficient number, since it is larger than the sum of its proper divisors (70562770).

78863870 is a wasteful number, since it uses less digits than its factorization.

78863870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415099.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 78863870 is about 8880.5332047124. The cubic root of 78863870 is about 428.8374401980.

The spelling of 78863870 in words is "seventy-eight million, eight hundred sixty-three thousand, eight hundred seventy".