51264140 has 12 divisors (see below), whose sum is σ = 107654736. Its totient is φ = 20505648.

The previous prime is 51264133. The next prime is 51264151. The reversal of 51264140 is 4146215.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281584 + ... + 1281623.

It is an arithmetic number, because the mean of its divisors is an integer number (8971228).

Almost surely, 2^51264140 is an apocalyptic number.

It is an amenable number.

51264140 is an abundant number, since it is smaller than the sum of its proper divisors (56390596).

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

51264140 is a wasteful number, since it uses less digits than its factorization.

51264140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563216 (or 2563214 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 51264140 is about 7159.8980439668. The cubic root of 51264140 is about 371.4821000622.

The spelling of 51264140 in words is "fifty-one million, two hundred sixty-four thousand, one hundred forty".