664585026 has 16 divisors (see below), whose sum is σ = 1519051584. Its totient is φ = 189881424.

The previous prime is 664585013. The next prime is 664585039. The reversal of 664585026 is 620585466.

It is an interprime number because it is at equal distance from previous prime (664585013) and next prime (664585039).

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 15823453 = 664585026 / (6 + 6 + 4 + 5 + 8 + 5 + 0 + 2 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7911685 + ... + 7911768.

It is an arithmetic number, because the mean of its divisors is an integer number (94940724).

Almost surely, 2^664585026 is an apocalyptic number.

664585026 is an abundant number, since it is smaller than the sum of its proper divisors (854466558).

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

664585026 is a wasteful number, since it uses less digits than its factorization.

664585026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15823465.

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 664585026 is about 25779.5466600947. The cubic root of 664585026 is about 872.6702764249.

The spelling of 664585026 in words is "six hundred sixty-four million, five hundred eighty-five thousand, twenty-six".