78319492 has 6 divisors (see below), whose sum is σ = 137059118. Its totient is φ = 39159744.

The previous prime is 78319489. The next prime is 78319499. The reversal of 78319492 is 29491387.

It can be written as a sum of positive squares in only one way, i.e., 49224256 + 29095236 = 7016^2 + 5394^2 .

It is a super-2 number, since 2×78319492² = 12267885654276128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78319499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9789933 + ... + 9789940.

Almost surely, 2^78319492 is an apocalyptic number.

It is an amenable number.

78319492 is a deficient number, since it is larger than the sum of its proper divisors (58739626).

78319492 is a wasteful number, since it uses less digits than its factorization.

78319492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19579877 (or 19579875 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 78319492 is about 8849.8300548655. The cubic root of 78319492 is about 427.8484411118.

The spelling of 78319492 in words is "seventy-eight million, three hundred nineteen thousand, four hundred ninety-two".