215825420 has 24 divisors (see below), whose sum is σ = 457473744. Its totient is φ = 85522496.

The previous prime is 215825413. The next prime is 215825429. The reversal of 215825420 is 24528512.

215825420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215825420² = 93161223836352800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215825429) 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, 48287 + ... + 52566.

It is an arithmetic number, because the mean of its divisors is an integer number (19061406).

Almost surely, 2^215825420 is an apocalyptic number.

215825420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215825420 is an abundant number, since it is smaller than the sum of its proper divisors (241648324).

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

215825420 is a wasteful number, since it uses less digits than its factorization.

215825420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100969 (or 100967 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 215825420 is about 14690.9979238988. The cubic root of 215825420 is about 599.8383082821.

The spelling of 215825420 in words is "two hundred fifteen million, eight hundred twenty-five thousand, four hundred twenty".