51263940 has 192 divisors, whose sum is σ = 181762560. Its totient is φ = 10506240.

The previous prime is 51263939. The next prime is 51263963. The reversal of 51263940 is 4936215.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51263898 and 51263907.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 223746 + ... + 223974.

It is an arithmetic number, because the mean of its divisors is an integer number (946680).

Almost surely, 2^51263940 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 51263940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90881280).

51263940 is an abundant number, since it is smaller than the sum of its proper divisors (130498620).

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

51263940 is a wasteful number, since it uses less digits than its factorization.

51263940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 51263940 is about 7159.8840772739. The cubic root of 51263940 is about 371.4816169661.

The spelling of 51263940 in words is "fifty-one million, two hundred sixty-three thousand, nine hundred forty".