264787721 has 8 divisors (see below), whose sum is σ = 288977664. Its totient is φ = 240617520.

The previous prime is 264787703. The next prime is 264787723. The reversal of 264787721 is 127787462.

264787721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 264787721 - 2¹⁸ = 264525577 is a prime.

It is a super-2 number, since 2×264787721² = 140225074384747682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264787723) 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, 46211 + ... + 51623.

It is an arithmetic number, because the mean of its divisors is an integer number (36122208).

Almost surely, 2^264787721 is an apocalyptic number.

It is an amenable number.

264787721 is a deficient number, since it is larger than the sum of its proper divisors (24189943).

264787721 is a wasteful number, since it uses less digits than its factorization.

264787721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9871.

The product of its digits is 263424, while the sum is 44.

The square root of 264787721 is about 16272.2991921855. The cubic root of 264787721 is about 642.1442734022.

The spelling of 264787721 in words is "two hundred sixty-four million, seven hundred eighty-seven thousand, seven hundred twenty-one".