215771340 has 24 divisors (see below), whose sum is σ = 604159920. Its totient is φ = 57539008.

The previous prime is 215771317. The next prime is 215771389. The reversal of 215771340 is 43177512.

215771340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 215771298 and 215771307.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1798035 + ... + 1798154.

It is an arithmetic number, because the mean of its divisors is an integer number (25173330).

Almost surely, 2^215771340 is an apocalyptic number.

215771340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215771340 is an abundant number, since it is smaller than the sum of its proper divisors (388388580).

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

215771340 is a wasteful number, since it uses less digits than its factorization.

215771340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3596201 (or 3596199 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 215771340 is about 14689.1572256546. The cubic root of 215771340 is about 599.7882030233.

The spelling of 215771340 in words is "two hundred fifteen million, seven hundred seventy-one thousand, three hundred forty".