1664772432 has 40 divisors (see below), whose sum is σ = 4303507296. Its totient is φ = 554557056.

The previous prime is 1664772427. The next prime is 1664772437. The reversal of 1664772432 is 2342774661.

It is an interprime number because it is at equal distance from previous prime (1664772427) and next prime (1664772437).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664772437) 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, 67438 + ... + 88754.

Almost surely, 2^1664772432 is an apocalyptic number.

1664772432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1664772432 is an abundant number, since it is smaller than the sum of its proper divisors (2638734864).

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

1664772432 is a wasteful number, since it uses less digits than its factorization.

1664772432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22955 (or 22949 counting only the distinct ones).

The product of its digits is 338688, while the sum is 42.

The square root of 1664772432 is about 40801.6229088991. The cubic root of 1664772432 is about 1185.1817585146.

The spelling of 1664772432 in words is "one billion, six hundred sixty-four million, seven hundred seventy-two thousand, four hundred thirty-two".