664974048 has 96 divisors (see below), whose sum is σ = 1792336896. Its totient is φ = 215771648.

The previous prime is 664974043. The next prime is 664974083. The reversal of 664974048 is 840479466.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 664973988 and 664974006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664974043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1321765 + ... + 1322267.

It is an arithmetic number, because the mean of its divisors is an integer number (18670176).

Almost surely, 2^664974048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664974048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896168448).

664974048 is an abundant number, since it is smaller than the sum of its proper divisors (1127362848).

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

664974048 is a wasteful number, since it uses less digits than its factorization.

664974048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 664974048 is about 25787.0907238486. The cubic root of 664974048 is about 872.8405188587.

The spelling of 664974048 in words is "six hundred sixty-four million, nine hundred seventy-four thousand, forty-eight".