51091264 has 28 divisors (see below), whose sum is σ = 115868704. Its totient is φ = 21896064.

The previous prime is 51091237. The next prime is 51091279. The reversal of 51091264 is 46219015.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×51091264² = 5220634514235392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56574 + ... + 57469.

It is an arithmetic number, because the mean of its divisors is an integer number (4138168).

Almost surely, 2^51091264 is an apocalyptic number.

It is an amenable number.

51091264 is an abundant number, since it is smaller than the sum of its proper divisors (64777440).

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

51091264 is a wasteful number, since it uses less digits than its factorization.

51091264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114062 (or 114052 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 51091264 is about 7147.8153305748. The cubic root of 51091264 is about 371.0640517324.

The spelling of 51091264 in words is "fifty-one million, ninety-one thousand, two hundred sixty-four".