78253947 has 12 divisors (see below), whose sum is σ = 113320584. Its totient is φ = 52036800.

The previous prime is 78253943. The next prime is 78253957. The reversal of 78253947 is 74935287.

78253947 is a `hidden beast` number, since 78 + 2 + 539 + 47 = 666.

It is not a de Polignac number, because 78253947 - 2² = 78253943 is a prime.

It is a super-2 number, since 2×78253947² = 12247360442157618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78253943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7233 + ... + 14450.

It is an arithmetic number, because the mean of its divisors is an integer number (9443382).

Almost surely, 2^78253947 is an apocalyptic number.

78253947 is a deficient number, since it is larger than the sum of its proper divisors (35066637).

78253947 is a wasteful number, since it uses less digits than its factorization.

78253947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22090 (or 22087 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 78253947 is about 8846.1261012943. The cubic root of 78253947 is about 427.7290534086.

The spelling of 78253947 in words is "seventy-eight million, two hundred fifty-three thousand, nine hundred forty-seven".