52820840 has 32 divisors (see below), whose sum is σ = 119313000. Its totient is φ = 21045504.

The previous prime is 52820837. The next prime is 52820843. The reversal of 52820840 is 4802825.

It is an interprime number because it is at equal distance from previous prime (52820837) and next prime (52820843).

It can be written as a sum of positive squares in 4 ways, for example, as 45670564 + 7150276 = 6758^2 + 2674^2 .

It is a super-2 number, since 2×52820840² = 5580082276611200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (52820843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8306 + ... + 13214.

Almost surely, 2^52820840 is an apocalyptic number.

It is an amenable number.

52820840 is an abundant number, since it is smaller than the sum of its proper divisors (66492160).

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

52820840 is a wasteful number, since it uses less digits than its factorization.

52820840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5189 (or 5185 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 52820840 is about 7267.7947136666. The cubic root of 52820840 is about 375.2048421595.

The spelling of 52820840 in words is "fifty-two million, eight hundred twenty thousand, eight hundred forty".