2658664 has 32 divisors (see below), whose sum is σ = 5355720. Its totient is φ = 1232896.

The previous prime is 2658661. The next prime is 2658671. The reversal of 2658664 is 4668562.

It can be written as a sum of positive squares in 4 ways, for example, as 2377764 + 280900 = 1542^2 + 530^2 .

It is a super-4 number, since 4×2658664⁴ (a number of 27 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (2658661) 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, 15282 + ... + 15454.

2^2658664 is an apocalyptic number.

It is an amenable number.

2658664 is an abundant number, since it is smaller than the sum of its proper divisors (2697056).

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

2658664 is a wasteful number, since it uses less digits than its factorization.

2658664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 305 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 2658664 is about 1630.5410145102. The cubic root of 2658664 is about 138.5333973946.

The spelling of 2658664 in words is "two million, six hundred fifty-eight thousand, six hundred sixty-four".