531615420 has 96 divisors (see below), whose sum is σ = 1890201600. Its totient is φ = 121511232.

The previous prime is 531615397. The next prime is 531615433. The reversal of 531615420 is 24516135.

531615420 is a `hidden beast` number, since 5 + 3 + 1 + 615 + 42 + 0 = 666.

It is a super-2 number, since 2×531615420² = 565229909563552800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66540 + ... + 74099.

It is an arithmetic number, because the mean of its divisors is an integer number (19689600).

Almost surely, 2^531615420 is an apocalyptic number.

It is an amenable number.

531615420 is an abundant number, since it is smaller than the sum of its proper divisors (1358586180).

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

531615420 is a wasteful number, since it uses less digits than its factorization.

531615420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140664 (or 140656 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 531615420 is about 23056.7868533324. The cubic root of 531615420 is about 810.0886048477.

It can be divided in two parts, 5316 and 15420, that added together give a 4-th power (20736 = 12⁴).

The spelling of 531615420 in words is "five hundred thirty-one million, six hundred fifteen thousand, four hundred twenty".