78642292 has 12 divisors (see below), whose sum is σ = 144867520. Its totient is φ = 37251576.

The previous prime is 78642283. The next prime is 78642293. The reversal of 78642292 is 29224687.

It is a super-2 number, since 2×78642292² = 12369220182026528, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78642293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517308 + ... + 517459.

Almost surely, 2^78642292 is an apocalyptic number.

It is an amenable number.

78642292 is a deficient number, since it is larger than the sum of its proper divisors (66225228).

78642292 is a wasteful number, since it uses less digits than its factorization.

78642292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034790 (or 1034788 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 78642292 is about 8868.0489398740. The cubic root of 78642292 is about 428.4354391608.

The spelling of 78642292 in words is "seventy-eight million, six hundred forty-two thousand, two hundred ninety-two".