51064420 has 36 divisors (see below), whose sum is σ = 117875772. Its totient is φ = 18568000.

The previous prime is 51064417. The next prime is 51064451. The reversal of 51064420 is 2446015.

It can be written as a sum of positive squares in 2 ways, for example, as 14992384 + 36072036 = 3872^2 + 6006^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 51064391 and 51064400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8131 + ... + 12970.

It is an arithmetic number, because the mean of its divisors is an integer number (3274327).

Almost surely, 2^51064420 is an apocalyptic number.

It is an amenable number.

51064420 is an abundant number, since it is smaller than the sum of its proper divisors (66811352).

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

51064420 is a wasteful number, since it uses less digits than its factorization.

51064420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21132 (or 21119 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 51064420 is about 7145.9373073097. The cubic root of 51064420 is about 370.9990530898. Note that the first 3 decimals are identical.

The spelling of 51064420 in words is "fifty-one million, sixty-four thousand, four hundred twenty".