1904664720 has 320 divisors, whose sum is σ = 6948126720. Its totient is φ = 422682624.

The previous prime is 1904664691. The next prime is 1904664721. The reversal of 1904664720 is 274664091.

It is a happy number.

It is a super-2 number, since 2×1904664720² = 7255495391225356800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1904664721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14997297 + ... + 14997423.

It is an arithmetic number, because the mean of its divisors is an integer number (21712896).

Almost surely, 2^1904664720 is an apocalyptic number.

1904664720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1904664720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3474063360).

1904664720 is an abundant number, since it is smaller than the sum of its proper divisors (5043462000).

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

1904664720 is a wasteful number, since it uses less digits than its factorization.

1904664720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 1904664720 is about 43642.4646416767. The cubic root of 1904664720 is about 1239.5751058980.

The spelling of 1904664720 in words is "one billion, nine hundred four million, six hundred sixty-four thousand, seven hundred twenty".