215720715 has 16 divisors (see below), whose sum is σ = 394460928. Its totient is φ = 98615136.

The previous prime is 215720689. The next prime is 215720717. The reversal of 215720715 is 517027512.

It is not a de Polignac number, because 215720715 - 2⁶ = 215720651 is a prime.

It is a super-2 number, since 2×215720715² = 93070853760222450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215720717) 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, 1027137 + ... + 1027346.

It is an arithmetic number, because the mean of its divisors is an integer number (24653808).

Almost surely, 2^215720715 is an apocalyptic number.

215720715 is a deficient number, since it is larger than the sum of its proper divisors (178740213).

215720715 is a wasteful number, since it uses less digits than its factorization.

215720715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054498.

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 215720715 is about 14687.4339147449. The cubic root of 215720715 is about 599.7412912434.

The spelling of 215720715 in words is "two hundred fifteen million, seven hundred twenty thousand, seven hundred fifteen".