264387993 has 4 divisors (see below), whose sum is σ = 352517328. Its totient is φ = 176258660.

The previous prime is 264387989. The next prime is 264388031. The reversal of 264387993 is 399783462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 264387993 - 2² = 264387989 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (264387923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44064663 + ... + 44064668.

It is an arithmetic number, because the mean of its divisors is an integer number (88129332).

Almost surely, 2^264387993 is an apocalyptic number.

It is an amenable number.

264387993 is a deficient number, since it is larger than the sum of its proper divisors (88129335).

264387993 is an equidigital number, since it uses as much as digits as its factorization.

264387993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88129334.

The product of its digits is 1959552, while the sum is 51.

The square root of 264387993 is about 16260.0120848664. The cubic root of 264387993 is about 641.8209800638.

The spelling of 264387993 in words is "two hundred sixty-four million, three hundred eighty-seven thousand, nine hundred ninety-three".