213604740 has 36 divisors (see below), whose sum is σ = 647934924. Its totient is φ = 56961216.

The previous prime is 213604739. The next prime is 213604747. The reversal of 213604740 is 47406312.

213604740 is a `hidden beast` number, since 2 + 13 + 604 + 7 + 40 = 666.

213604740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 33454656 + 180150084 = 5784^2 + 13422^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (213604747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 593167 + ... + 593526.

Almost surely, 2^213604740 is an apocalyptic number.

213604740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213604740 is an abundant number, since it is smaller than the sum of its proper divisors (434330184).

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

213604740 is a wasteful number, since it uses less digits than its factorization.

213604740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186708 (or 1186703 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 213604740 is about 14615.2228857448. Note that the first 3 decimals coincide. The cubic root of 213604740 is about 597.7739178109.

The spelling of 213604740 in words is "two hundred thirteen million, six hundred four thousand, seven hundred forty".