26690640 has 40 divisors (see below), whose sum is σ = 82741728. Its totient is φ = 7117440.

The previous prime is 26690639. The next prime is 26690681. The reversal of 26690640 is 4609662.

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, 55366 + ... + 55845.

Almost surely, 2^26690640 is an apocalyptic number.

26690640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26690640 is an abundant number, since it is smaller than the sum of its proper divisors (56051088).

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

26690640 is a wasteful number, since it uses less digits than its factorization.

26690640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111227 (or 111221 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 26690640 is about 5166.2984815049. The cubic root of 26690640 is about 298.8498181300.

The spelling of 26690640 in words is "twenty-six million, six hundred ninety thousand, six hundred forty".