664057020 has 48 divisors (see below), whose sum is σ = 2028394368. Its totient is φ = 160983360.

The previous prime is 664057013. The next prime is 664057039. The reversal of 664057020 is 20750466.

It is a super-2 number, since 2×664057020² = 881943451622560800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502414 + ... + 503733.

It is an arithmetic number, because the mean of its divisors is an integer number (42258216).

Almost surely, 2^664057020 is an apocalyptic number.

664057020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664057020 is an abundant number, since it is smaller than the sum of its proper divisors (1364337348).

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

664057020 is a wasteful number, since it uses less digits than its factorization.

664057020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006170 (or 1006168 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 664057020 is about 25769.3038322730. The cubic root of 664057020 is about 872.4391059928.

The spelling of 664057020 in words is "six hundred sixty-four million, fifty-seven thousand, twenty".