1664649260 has 24 divisors (see below), whose sum is σ = 3499759536. Its totient is φ = 665098560.

The previous prime is 1664649257. The next prime is 1664649293. The reversal of 1664649260 is 629464661.

It is a happy number.

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, 29471 + ... + 64790.

It is an arithmetic number, because the mean of its divisors is an integer number (145823314).

Almost surely, 2^1664649260 is an apocalyptic number.

1664649260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664649260 is an abundant number, since it is smaller than the sum of its proper divisors (1835110276).

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

1664649260 is a wasteful number, since it uses less digits than its factorization.

1664649260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95153 (or 95151 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 1664649260 is about 40800.1134802343. The cubic root of 1664649260 is about 1185.1525283317.

The spelling of 1664649260 in words is "one billion, six hundred sixty-four million, six hundred forty-nine thousand, two hundred sixty".