52217840 has 20 divisors (see below), whose sum is σ = 121406664. Its totient is φ = 20887104.

The previous prime is 52217839. The next prime is 52217911. The reversal of 52217840 is 4871225.

It is a tau number, because it is divible by the number of its divisors (20).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326282 + ... + 326441.

Almost surely, 2^52217840 is an apocalyptic number.

It is an amenable number.

52217840 is an abundant number, since it is smaller than the sum of its proper divisors (69188824).

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

52217840 is a wasteful number, since it uses less digits than its factorization.

52217840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652736 (or 652730 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 52217840 is about 7226.1912512748. The cubic root of 52217840 is about 373.7716012317.

The spelling of 52217840 in words is "fifty-two million, two hundred seventeen thousand, eight hundred forty".