78649292 has 6 divisors (see below), whose sum is σ = 137636268. Its totient is φ = 39324644.

The previous prime is 78649289. The next prime is 78649321. The reversal of 78649292 is 29294687.

It is a super-2 number, since 2×78649292² = 12371422264202528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9831158 + ... + 9831165.

It is an arithmetic number, because the mean of its divisors is an integer number (22939378).

Almost surely, 2^78649292 is an apocalyptic number.

It is an amenable number.

78649292 is a deficient number, since it is larger than the sum of its proper divisors (58986976).

78649292 is a wasteful number, since it uses less digits than its factorization.

78649292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19662327 (or 19662325 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 78649292 is about 8868.4436064058. The cubic root of 78649292 is about 428.4481505532.

The spelling of 78649292 in words is "seventy-eight million, six hundred forty-nine thousand, two hundred ninety-two".