78178942 has 16 divisors (see below), whose sum is σ = 120304800. Its totient is φ = 38089440.

The previous prime is 78178921. The next prime is 78178967. The reversal of 78178942 is 24987187.

It is a super-2 number, since 2×78178942² = 12223893944478728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78178892 and 78178901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10359 + ... + 16237.

It is an arithmetic number, because the mean of its divisors is an integer number (7519050).

Almost surely, 2^78178942 is an apocalyptic number.

78178942 is a deficient number, since it is larger than the sum of its proper divisors (42125858).

78178942 is a wasteful number, since it uses less digits than its factorization.

78178942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6051.

The product of its digits is 225792, while the sum is 46.

The square root of 78178942 is about 8841.8856586138. The cubic root of 78178942 is about 427.5923528574.

The spelling of 78178942 in words is "seventy-eight million, one hundred seventy-eight thousand, nine hundred forty-two".