213678945 has 32 divisors (see below), whose sum is σ = 380486400. Its totient is φ = 113778432.

The previous prime is 213678937. The next prime is 213678953. The reversal of 213678945 is 549876312.

It is an interprime number because it is at equal distance from previous prime (213678937) and next prime (213678953).

It is not a de Polignac number, because 213678945 - 2³ = 213678937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 213678945.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142761 + ... + 144249.

It is an arithmetic number, because the mean of its divisors is an integer number (11890200).

Almost surely, 2^213678945 is an apocalyptic number.

It is an amenable number.

213678945 is a deficient number, since it is larger than the sum of its proper divisors (166807455).

213678945 is a wasteful number, since it uses less digits than its factorization.

213678945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566 (or 2560 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 213678945 is about 14617.7612855047. The cubic root of 213678945 is about 597.8431308162.

The spelling of 213678945 in words is "two hundred thirteen million, six hundred seventy-eight thousand, nine hundred forty-five".