78954993 has 40 divisors (see below), whose sum is σ = 128493288. Its totient is φ = 48024576.

The previous prime is 78954989. The next prime is 78955027. The reversal of 78954993 is 39945987.

78954993 is a `hidden beast` number, since 7 + 8 + 9 + 549 + 93 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 685584 + 78269409 = 828^2 + 8847^2 .

It is not a de Polignac number, because 78954993 - 2² = 78954989 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78954943) 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 39 ways as a sum of consecutive naturals, for example, 101755 + ... + 102527.

Almost surely, 2^78954993 is an apocalyptic number.

It is an amenable number.

78954993 is a deficient number, since it is larger than the sum of its proper divisors (49538295).

78954993 is a wasteful number, since it uses less digits than its factorization.

78954993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895 (or 886 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 78954993 is about 8885.6622150518. The cubic root of 78954993 is about 429.0025428966.

The spelling of 78954993 in words is "seventy-eight million, nine hundred fifty-four thousand, nine hundred ninety-three".