78023990 has 32 divisors (see below), whose sum is σ = 153576864. Its totient is φ = 28304640.

The previous prime is 78023989. The next prime is 78024029. The reversal of 78023990 is 9932087.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82802 + ... + 83738.

It is an arithmetic number, because the mean of its divisors is an integer number (4799277).

Almost surely, 2^78023990 is an apocalyptic number.

78023990 is a deficient number, since it is larger than the sum of its proper divisors (75552874).

78023990 is a wasteful number, since it uses less digits than its factorization.

78023990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 78023990 is about 8833.1189282156. The cubic root of 78023990 is about 427.3096675608.

The spelling of 78023990 in words is "seventy-eight million, twenty-three thousand, nine hundred ninety".