26400013998 has 32 divisors (see below), whose sum is σ = 53174016000. Its totient is φ = 8737717536.

The previous prime is 26400013987. The next prime is 26400014023. The reversal of 26400013998 is 89931000462.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4487623 + ... + 4493501.

It is an arithmetic number, because the mean of its divisors is an integer number (1661688000).

Almost surely, 2^26400013998 is an apocalyptic number.

26400013998 is an abundant number, since it is smaller than the sum of its proper divisors (26774002002).

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

26400013998 is a wasteful number, since it uses less digits than its factorization.

26400013998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11056.

The product of its (nonzero) digits is 93312, while the sum is 42.

It can be divided in two parts, 26400013 and 998, that added together give a triangular number (26401011 = T₇₂₆₆).

The spelling of 26400013998 in words is "twenty-six billion, four hundred million, thirteen thousand, nine hundred ninety-eight".