264139890 has 48 divisors (see below), whose sum is σ = 737439552. Its totient is φ = 60374496.

The previous prime is 264139867. The next prime is 264139901. The reversal of 264139890 is 98931462.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88374 + ... + 91313.

It is an arithmetic number, because the mean of its divisors is an integer number (15363324).

Almost surely, 2^264139890 is an apocalyptic number.

264139890 is an abundant number, since it is smaller than the sum of its proper divisors (473299662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

264139890 is a wasteful number, since it uses less digits than its factorization.

264139890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179711 (or 179704 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 264139890 is about 16252.3810563253. The cubic root of 264139890 is about 641.6201545717.

The spelling of 264139890 in words is "two hundred sixty-four million, one hundred thirty-nine thousand, eight hundred ninety".