26402629840 has 40 divisors (see below), whose sum is σ = 61398523368. Its totient is φ = 10558917120.

The previous prime is 26402629811. The next prime is 26402629871. The reversal of 26402629840 is 4892620462.

It can be written as a sum of positive squares in 4 ways, for example, as 7271313984 + 19131315856 = 85272^2 + 138316^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399814 + ... + 461146.

Almost surely, 2^26402629840 is an apocalyptic number.

26402629840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26402629840 is an abundant number, since it is smaller than the sum of its proper divisors (34995893528).

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

26402629840 is a wasteful number, since it uses less digits than its factorization.

26402629840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66727 (or 66721 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 26402629840 in words is "twenty-six billion, four hundred two million, six hundred twenty-nine thousand, eight hundred forty".