1664769240 has 64 divisors (see below), whose sum is σ = 5549234400. Its totient is φ = 443938176.

The previous prime is 1664769229. The next prime is 1664769269. The reversal of 1664769240 is 429674661.

1664769240 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769647 + ... + 771806.

Almost surely, 2^1664769240 is an apocalyptic number.

1664769240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664769240 is an abundant number, since it is smaller than the sum of its proper divisors (3884465160).

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

1664769240 is a wasteful number, since it uses less digits than its factorization.

1664769240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541473 (or 1541463 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 1664769240 is about 40801.5837927892. The cubic root of 1664769240 is about 1185.1810010332.

The spelling of 1664769240 in words is "one billion, six hundred sixty-four million, seven hundred sixty-nine thousand, two hundred forty".