78539239401 has 32 divisors (see below), whose sum is σ = 126375336960. Its totient is φ = 42383290176.

The previous prime is 78539239399. The next prime is 78539239411. The reversal of 78539239401 is 10493293587.

It is not a de Polignac number, because 78539239401 - 2¹ = 78539239399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78539239411) 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, 183991 + ... + 436956.

It is an arithmetic number, because the mean of its divisors is an integer number (3949229280).

Almost surely, 2^78539239401 is an apocalyptic number.

It is an amenable number.

78539239401 is a deficient number, since it is larger than the sum of its proper divisors (47836097559).

78539239401 is a wasteful number, since it uses less digits than its factorization.

78539239401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621293.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 78539239401 in words is "seventy-eight billion, five hundred thirty-nine million, two hundred thirty-nine thousand, four hundred one".