52640666 has 32 divisors (see below), whose sum is σ = 88467456. Its totient is φ = 23328000.

The previous prime is 52640641. The next prime is 52640681. The reversal of 52640666 is 66604625.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194111 + ... + 194381.

It is an arithmetic number, because the mean of its divisors is an integer number (2764608).

Almost surely, 2^52640666 is an apocalyptic number.

52640666 is a deficient number, since it is larger than the sum of its proper divisors (35826790).

52640666 is a wasteful number, since it uses less digits than its factorization.

52640666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 52640666 is about 7255.3887559524. The cubic root of 52640666 is about 374.7777432608. Note that the first 4 decimals are identical.

The spelling of 52640666 in words is "fifty-two million, six hundred forty thousand, six hundred sixty-six".