51002280 has 192 divisors, whose sum is σ = 194912640. Its totient is φ = 11321856.

The previous prime is 51002269. The next prime is 51002323. The reversal of 51002280 is 8220015.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92967 + ... + 93513.

It is an arithmetic number, because the mean of its divisors is an integer number (1015170).

Almost surely, 2^51002280 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 51002280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97456320).

51002280 is an abundant number, since it is smaller than the sum of its proper divisors (143910360).

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

51002280 is a wasteful number, since it uses less digits than its factorization.

51002280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 51002280 is about 7141.5880586883. The cubic root of 51002280 is about 370.8485031318.

Adding to 51002280 its reverse (8220015), we get a palindrome (59222295).

The spelling of 51002280 in words is "fifty-one million, two thousand, two hundred eighty".