51502780 has 48 divisors (see below), whose sum is σ = 127604736. Its totient is φ = 17087040.

The previous prime is 51502771. The next prime is 51502783. The reversal of 51502780 is 8720515.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51502783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1594 + ... + 10273.

It is an arithmetic number, because the mean of its divisors is an integer number (2658432).

Almost surely, 2^51502780 is an apocalyptic number.

It is an amenable number.

51502780 is an abundant number, since it is smaller than the sum of its proper divisors (76101956).

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

51502780 is a wasteful number, since it uses less digits than its factorization.

51502780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11914 (or 11912 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 51502780 is about 7176.5437363678. The cubic root of 51502780 is about 372.0576374253.

The spelling of 51502780 in words is "fifty-one million, five hundred two thousand, seven hundred eighty".