26391431604 has 48 divisors (see below), whose sum is σ = 67639380480. Its totient is φ = 7971780960.

The previous prime is 26391431579. The next prime is 26391431629. The reversal of 26391431604 is 40613419362.

It is an interprime number because it is at equal distance from previous prime (26391431579) and next prime (26391431629).

It is a super-2 number, since 2×26391431604² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2511102 + ... + 2521589.

It is an arithmetic number, because the mean of its divisors is an integer number (1409153760).

Almost surely, 2^26391431604 is an apocalyptic number.

It is an amenable number.

26391431604 is an abundant number, since it is smaller than the sum of its proper divisors (41247948876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26391431604 is a wasteful number, since it uses less digits than its factorization.

26391431604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5032740 (or 5032738 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 39.

The spelling of 26391431604 in words is "twenty-six billion, three hundred ninety-one million, four hundred thirty-one thousand, six hundred four".