26640625 has 32 divisors (see below), whose sum is σ = 37499904. Its totient is φ = 18750000.

The previous prime is 26640599. The next prime is 26640631. The reversal of 26640625 is 52604662.

It is not a de Polignac number, because 26640625 - 2²¹ = 24543473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 859360 + ... + 859390.

It is an arithmetic number, because the mean of its divisors is an integer number (1171872).

Almost surely, 2^26640625 is an apocalyptic number.

26640625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

26640625 is a deficient number, since it is larger than the sum of its proper divisors (10859279).

26640625 is an frugal number, since it uses more digits than its factorization.

26640625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 26640625 is about 5161.4557055156. The cubic root of 26640625 is about 298.6630320550.

The spelling of 26640625 in words is "twenty-six million, six hundred forty thousand, six hundred twenty-five".