264978993 has 4 divisors (see below), whose sum is σ = 353305328. Its totient is φ = 176652660.

The previous prime is 264978991. The next prime is 264979019. The reversal of 264978993 is 399879462.

264978993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 264978993 - 2¹ = 264978991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264978991) 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, 44163163 + ... + 44163168.

It is an arithmetic number, because the mean of its divisors is an integer number (88326332).

Almost surely, 2^264978993 is an apocalyptic number.

It is an amenable number.

264978993 is a deficient number, since it is larger than the sum of its proper divisors (88326335).

264978993 is an equidigital number, since it uses as much as digits as its factorization.

264978993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88326334.

The product of its digits is 5878656, while the sum is 57.

The square root of 264978993 is about 16278.1753584362. The cubic root of 264978993 is about 642.2988559189.

The spelling of 264978993 in words is "two hundred sixty-four million, nine hundred seventy-eight thousand, nine hundred ninety-three".