78509492 has 12 divisors (see below), whose sum is σ = 137454660. Its totient is φ = 39236736.

The previous prime is 78509429. The next prime is 78509503. The reversal of 78509492 is 29490587.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2540836 + 75968656 = 1594^2 + 8716^2 .

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12134 + ... + 17442.

It is an arithmetic number, because the mean of its divisors is an integer number (11454555).

Almost surely, 2^78509492 is an apocalyptic number.

It is an amenable number.

78509492 is a deficient number, since it is larger than the sum of its proper divisors (58945168).

78509492 is a wasteful number, since it uses less digits than its factorization.

78509492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010 (or 9008 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 78509492 is about 8860.5582216924. The cubic root of 78509492 is about 428.1941428597.

The spelling of 78509492 in words is "seventy-eight million, five hundred nine thousand, four hundred ninety-two".