264278421 has 24 divisors (see below), whose sum is σ = 430803360. Its totient is φ = 154644000.

The previous prime is 264278419. The next prime is 264278423. The reversal of 264278421 is 124872462.

264278421 is a `hidden beast` number, since 2 + 642 + 7 + 8 + 4 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (264278419) and next prime (264278423).

It is not a de Polignac number, because 264278421 - 2¹ = 264278419 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264278423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43155 + ... + 48896.

It is an arithmetic number, because the mean of its divisors is an integer number (17950140).

Almost surely, 2^264278421 is an apocalyptic number.

It is an amenable number.

264278421 is a deficient number, since it is larger than the sum of its proper divisors (166524939).

264278421 is a wasteful number, since it uses less digits than its factorization.

264278421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92097 (or 92094 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 264278421 is about 16256.6423655071. The cubic root of 264278421 is about 641.7323031600.

The spelling of 264278421 in words is "two hundred sixty-four million, two hundred seventy-eight thousand, four hundred twenty-one".