52640665 has 32 divisors (see below), whose sum is σ = 79877376. Its totient is φ = 32348160.

The previous prime is 52640641. The next prime is 52640681. The reversal of 52640665 is 56604625.

It is not a de Polignac number, because 52640665 - 2⁹ = 52640153 is a prime.

It is a super-2 number, since 2×52640665² = 5542079223284450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52640665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27169 + ... + 29041.

It is an arithmetic number, because the mean of its divisors is an integer number (2496168).

Almost surely, 2^52640665 is an apocalyptic number.

52640665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

52640665 is a deficient number, since it is larger than the sum of its proper divisors (27236711).

52640665 is a wasteful number, since it uses less digits than its factorization.

52640665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 52640665 is about 7255.3886870381. The cubic root of 52640665 is about 374.7777408876. Note that the first 4 decimals are identical.

The spelling of 52640665 in words is "fifty-two million, six hundred forty thousand, six hundred sixty-five".