664423070 has 16 divisors (see below), whose sum is σ = 1266312528. Its totient is φ = 250135680.

The previous prime is 664423061. The next prime is 664423079. The reversal of 664423070 is 70324466.

It is an interprime number because it is at equal distance from previous prime (664423061) and next prime (664423079).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664423079) 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, 1954016 + ... + 1954355.

It is an arithmetic number, because the mean of its divisors is an integer number (79144533).

Almost surely, 2^664423070 is an apocalyptic number.

664423070 is a deficient number, since it is larger than the sum of its proper divisors (601889458).

664423070 is a wasteful number, since it uses less digits than its factorization.

664423070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3908395.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 664423070 is about 25776.4052963170. The cubic root of 664423070 is about 872.5993822257.

The spelling of 664423070 in words is "six hundred sixty-four million, four hundred twenty-three thousand, seventy".