51383880 has 48 divisors (see below), whose sum is σ = 166998780. Its totient is φ = 13702272.

The previous prime is 51383879. The next prime is 51383881. The reversal of 51383880 is 8838315.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51383879) and next prime (51383881).

It can be written as a sum of positive squares in 2 ways, for example, as 46212804 + 5171076 = 6798^2 + 2274^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51383881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71007 + ... + 71726.

Almost surely, 2^51383880 is an apocalyptic number.

It is an amenable number.

51383880 is an abundant number, since it is smaller than the sum of its proper divisors (115614900).

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

51383880 is a wasteful number, since it uses less digits than its factorization.

51383880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142750 (or 142743 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 51383880 is about 7168.2550177850. The cubic root of 51383880 is about 371.7711044176.

The spelling of 51383880 in words is "fifty-one million, three hundred eighty-three thousand, eight hundred eighty".