52640394 has 32 divisors (see below), whose sum is σ = 110471040. Its totient is φ = 16699200.

The previous prime is 52640389. The next prime is 52640417. The reversal of 52640394 is 49304625.

It is a super-2 number, since 2×52640394² = 5542022160950472, which contains 22 as substring.

It is a Curzon number.

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, 10224 + ... + 14484.

It is an arithmetic number, because the mean of its divisors is an integer number (3452220).

Almost surely, 2^52640394 is an apocalyptic number.

52640394 is an abundant number, since it is smaller than the sum of its proper divisors (57830646).

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

52640394 is a wasteful number, since it uses less digits than its factorization.

52640394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 52640394 is about 7255.3700112400. The cubic root of 52640394 is about 374.7770977540. Note that the first 3 decimals are identical.

The spelling of 52640394 in words is "fifty-two million, six hundred forty thousand, three hundred ninety-four".