78523930 has 32 divisors (see below), whose sum is σ = 146488320. Its totient is φ = 30274560.

The previous prime is 78523919. The next prime is 78523931. The reversal of 78523930 is 3932587.

It is a self number, because there is not a number n which added to its sum of digits gives 78523930.

It is not an unprimeable number, because it can be changed into a prime (78523931) by changing a digit.

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, 135802 + ... + 136378.

It is an arithmetic number, because the mean of its divisors is an integer number (4577760).

Almost surely, 2^78523930 is an apocalyptic number.

78523930 is a deficient number, since it is larger than the sum of its proper divisors (67964390).

78523930 is a wasteful number, since it uses less digits than its factorization.

78523930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 78523930 is about 8861.3729184591. The cubic root of 78523930 is about 428.2203897417.

The spelling of 78523930 in words is "seventy-eight million, five hundred twenty-three thousand, nine hundred thirty".