215742620 has 12 divisors (see below), whose sum is σ = 453059544. Its totient is φ = 86297040.

The previous prime is 215742617. The next prime is 215742661. The reversal of 215742620 is 26247512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5393546 + ... + 5393585.

It is an arithmetic number, because the mean of its divisors is an integer number (37754962).

Almost surely, 2^215742620 is an apocalyptic number.

215742620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215742620 is an abundant number, since it is smaller than the sum of its proper divisors (237316924).

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

215742620 is a wasteful number, since it uses less digits than its factorization.

215742620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10787140 (or 10787138 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 215742620 is about 14688.1796012985. The cubic root of 215742620 is about 599.7615904659.

The spelling of 215742620 in words is "two hundred fifteen million, seven hundred forty-two thousand, six hundred twenty".