27620640 has 72 divisors (see below), whose sum is σ = 94260348. Its totient is φ = 7365120.

The previous prime is 27620639. The next prime is 27620647. The reversal of 27620640 is 4602672.

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 121104 = 5244^2 + 348^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (27620647) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 8151 + ... + 11030.

Almost surely, 2^27620640 is an apocalyptic number.

27620640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27620640 is an abundant number, since it is smaller than the sum of its proper divisors (66639708).

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

27620640 is a wasteful number, since it uses less digits than its factorization.

27620640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19202 (or 19191 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 27620640 is about 5255.5342259375. The cubic root of 27620640 is about 302.2812753053.

The spelling of 27620640 in words is "twenty-seven million, six hundred twenty thousand, six hundred forty".