51964740 has 60 divisors (see below), whose sum is σ = 163020396. Its totient is φ = 13856832.

The previous prime is 51964729. The next prime is 51964771. The reversal of 51964740 is 4746915.

51964740 is a `hidden beast` number, since 5 + 1 + 9 + 647 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 40144896 + 11819844 = 6336^2 + 3438^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51964695 and 51964704.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14419 + ... + 17658.

Almost surely, 2^51964740 is an apocalyptic number.

It is an amenable number.

51964740 is an abundant number, since it is smaller than the sum of its proper divisors (111055656).

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

51964740 is a wasteful number, since it uses less digits than its factorization.

51964740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32098 (or 32087 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 51964740 is about 7208.6572952250. The cubic root of 51964740 is about 373.1667322834.

The spelling of 51964740 in words is "fifty-one million, nine hundred sixty-four thousand, seven hundred forty".