51702640 has 80 divisors (see below), whose sum is σ = 134428896. Its totient is φ = 18329600.

The previous prime is 51702617. The next prime is 51702647. The reversal of 51702640 is 4620715.

51702640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51702647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35364 + ... + 36796.

Almost surely, 2^51702640 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 51702640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67214448).

51702640 is an abundant number, since it is smaller than the sum of its proper divisors (82726256).

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

51702640 is a wasteful number, since it uses less digits than its factorization.

51702640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 51702640 is about 7190.4547839480. The cubic root of 51702640 is about 372.5382811280.

The spelling of 51702640 in words is "fifty-one million, seven hundred two thousand, six hundred forty".