291864064 has 20 divisors (see below), whose sum is σ = 583159104. Its totient is φ = 145931776.

The previous prime is 291864061. The next prime is 291864113. The reversal of 291864064 is 460468192.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291864061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 284512 + ... + 285535.

Almost surely, 2^291864064 is an apocalyptic number.

It is an amenable number.

291864064 is a deficient number, since it is larger than the sum of its proper divisors (291295040).

291864064 is an frugal number, since it uses more digits than its factorization.

291864064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570065 (or 570049 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 291864064 is about 17084.0295012623. The cubic root of 291864064 is about 663.3257781070.

The spelling of 291864064 in words is "two hundred ninety-one million, eight hundred sixty-four thousand, sixty-four".