215530740 has 48 divisors (see below), whose sum is σ = 670541760. Its totient is φ = 57474720.

The previous prime is 215530739. The next prime is 215530753. The reversal of 215530740 is 47035512.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 199026 + ... + 200105.

It is an arithmetic number, because the mean of its divisors is an integer number (13969620).

Almost surely, 2^215530740 is an apocalyptic number.

215530740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215530740 is an abundant number, since it is smaller than the sum of its proper divisors (455011020).

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

215530740 is a wasteful number, since it uses less digits than its factorization.

215530740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399149 (or 399141 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 215530740 is about 14680.9652271232. The cubic root of 215530740 is about 599.5651849693.

The spelling of 215530740 in words is "two hundred fifteen million, five hundred thirty thousand, seven hundred forty".