213457660 has 24 divisors (see below), whose sum is σ = 482743296. Its totient is φ = 78815040.

The previous prime is 213457639. The next prime is 213457667. The reversal of 213457660 is 66754312.

It is a happy number.

It is a super-2 number, since 2×213457660² = 91128345225351200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213457667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410236 + ... + 410755.

It is an arithmetic number, because the mean of its divisors is an integer number (20114304).

Almost surely, 2^213457660 is an apocalyptic number.

213457660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213457660 is an abundant number, since it is smaller than the sum of its proper divisors (269285636).

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

213457660 is a wasteful number, since it uses less digits than its factorization.

213457660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821013 (or 821011 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 213457660 is about 14610.1902793906. The cubic root of 213457660 is about 597.6366849400.

The spelling of 213457660 in words is "two hundred thirteen million, four hundred fifty-seven thousand, six hundred sixty".