264680639 has 4 divisors (see below), whose sum is σ = 264719856. Its totient is φ = 264641424.

The previous prime is 264680627. The next prime is 264680681. The reversal of 264680639 is 936086462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936086462 = 2 ⋅468043231.

It is a cyclic number.

It is not a de Polignac number, because 264680639 - 2⁴ = 264680623 is a prime.

It is a super-2 number, since 2×264680639² = 140111681322896642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 264680639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263680639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6614 + ... + 23939.

It is an arithmetic number, because the mean of its divisors is an integer number (66179964).

Almost surely, 2^264680639 is an apocalyptic number.

264680639 is a deficient number, since it is larger than the sum of its proper divisors (39217).

264680639 is an equidigital number, since it uses as much as digits as its factorization.

264680639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39216.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 264680639 is about 16269.0085438542. The cubic root of 264680639 is about 642.0576991908.

The spelling of 264680639 in words is "two hundred sixty-four million, six hundred eighty thousand, six hundred thirty-nine".