78690253439 has 32 divisors (see below), whose sum is σ = 92778255360. Its totient is φ = 65347805952.

The previous prime is 78690253427. The next prime is 78690253457. The reversal of 78690253439 is 93435209687.

It is a cyclic number.

It is not a de Polignac number, because 78690253439 - 2⁴ = 78690253423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78690250439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48966374 + ... + 48967980.

It is an arithmetic number, because the mean of its divisors is an integer number (2899320480).

Almost surely, 2^78690253439 is an apocalyptic number.

78690253439 is a deficient number, since it is larger than the sum of its proper divisors (14088001921).

78690253439 is a wasteful number, since it uses less digits than its factorization.

78690253439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239.

The product of its (nonzero) digits is 9797760, while the sum is 56.

The spelling of 78690253439 in words is "seventy-eight billion, six hundred ninety million, two hundred fifty-three thousand, four hundred thirty-nine".