51470640 has 300 divisors, whose sum is σ = 197692704. Its totient is φ = 12400128.

The previous prime is 51470599. The next prime is 51470647. The reversal of 51470640 is 4607415.

51470640 is a `hidden beast` number, since 5 + 14 + 7 + 0 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51470647) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1095097 + ... + 1095143.

Almost surely, 2^51470640 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 51470640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98846352).

51470640 is an abundant number, since it is smaller than the sum of its proper divisors (146222064).

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

51470640 is a wasteful number, since it uses less digits than its factorization.

51470640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 51470640 is about 7174.3041474418. The cubic root of 51470640 is about 371.9802278773.

The spelling of 51470640 in words is "fifty-one million, four hundred seventy thousand, six hundred forty".