51640356 has 48 divisors (see below), whose sum is σ = 128447424. Its totient is φ = 16091136.

The previous prime is 51640297. The next prime is 51640363. The reversal of 51640356 is 65304615.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32476 + ... + 34028.

It is an arithmetic number, because the mean of its divisors is an integer number (2675988).

Almost surely, 2^51640356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51640356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64223712).

51640356 is an abundant number, since it is smaller than the sum of its proper divisors (76807068).

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

51640356 is a wasteful number, since it uses less digits than its factorization.

51640356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 51640356 is about 7186.1224592961. The cubic root of 51640356 is about 372.3886272751.

The spelling of 51640356 in words is "fifty-one million, six hundred forty thousand, three hundred fifty-six".