78923990 has 16 divisors (see below), whose sum is σ = 144184752. Its totient is φ = 31098144.

The previous prime is 78923989. The next prime is 78924011. The reversal of 78923990 is 9932987.

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, 58229 + ... + 59568.

It is an arithmetic number, because the mean of its divisors is an integer number (9011547).

Almost surely, 2^78923990 is an apocalyptic number.

78923990 is a deficient number, since it is larger than the sum of its proper divisors (65260762).

78923990 is a wasteful number, since it uses less digits than its factorization.

78923990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117871.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 78923990 is about 8883.9174917375. The cubic root of 78923990 is about 428.9463838681.

The spelling of 78923990 in words is "seventy-eight million, nine hundred twenty-three thousand, nine hundred ninety".