52809918 has 32 divisors (see below), whose sum is σ = 121236480. Its totient is φ = 15022560.

The previous prime is 52809917. The next prime is 52809923. The reversal of 52809918 is 81990825.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 52809918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52809917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7408 + ... + 12668.

It is an arithmetic number, because the mean of its divisors is an integer number (3788640).

Almost surely, 2^52809918 is an apocalyptic number.

52809918 is an abundant number, since it is smaller than the sum of its proper divisors (68426562).

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

52809918 is a wasteful number, since it uses less digits than its factorization.

52809918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5512.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 52809918 is about 7267.0432777024. The cubic root of 52809918 is about 375.1789794522.

The spelling of 52809918 in words is "fifty-two million, eight hundred nine thousand, nine hundred eighteen".