189764564 has 48 divisors (see below), whose sum is σ = 381278016. Its totient is φ = 81849600.

The previous prime is 189764551. The next prime is 189764567. The reversal of 189764564 is 465467981.

It is a super-2 number, since 2×189764564² = 72021179500220192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189764567) 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, 65327 + ... + 68169.

It is an arithmetic number, because the mean of its divisors is an integer number (7943292).

Almost surely, 2^189764564 is an apocalyptic number.

It is an amenable number.

189764564 is an abundant number, since it is smaller than the sum of its proper divisors (191513452).

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

189764564 is a wasteful number, since it uses less digits than its factorization.

189764564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936 (or 2934 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The square root of 189764564 is about 13775.5059435216. The cubic root of 189764564 is about 574.6521540745.

The spelling of 189764564 in words is "one hundred eighty-nine million, seven hundred sixty-four thousand, five hundred sixty-four".