215706307450 has 48 divisors (see below), whose sum is σ = 432631059840. Its totient is φ = 79747632000.

The previous prime is 215706307447. The next prime is 215706307451. The reversal of 215706307450 is 54703607512.

It is a super-2 number, since 2×215706307450² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215706307451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2730066 + ... + 2807965.

It is an arithmetic number, because the mean of its divisors is an integer number (9013147080).

Almost surely, 2^215706307450 is an apocalyptic number.

215706307450 is an abundant number, since it is smaller than the sum of its proper divisors (216924752390).

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

215706307450 is a wasteful number, since it uses less digits than its factorization.

215706307450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538103 (or 5538098 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 40.

The spelling of 215706307450 in words is "two hundred fifteen billion, seven hundred six million, three hundred seven thousand, four hundred fifty".