78591028 has 6 divisors (see below), whose sum is σ = 137534306. Its totient is φ = 39295512.

The previous prime is 78591013. The next prime is 78591043. The reversal of 78591028 is 82019587.

It is an interprime number because it is at equal distance from previous prime (78591013) and next prime (78591043).

It can be written as a sum of positive squares in only one way, i.e., 75307684 + 3283344 = 8678^2 + 1812^2 .

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 as a sum of consecutive naturals, namely, 9823875 + ... + 9823882.

Almost surely, 2^78591028 is an apocalyptic number.

It is an amenable number.

78591028 is a deficient number, since it is larger than the sum of its proper divisors (58943278).

78591028 is a wasteful number, since it uses less digits than its factorization.

78591028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19647761 (or 19647759 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 78591028 is about 8865.1580922170. The cubic root of 78591028 is about 428.3423251892.

The spelling of 78591028 in words is "seventy-eight million, five hundred ninety-one thousand, twenty-eight".