51125040 has 80 divisors (see below), whose sum is σ = 176104800. Its totient is φ = 13632768.

The previous prime is 51125027. The next prime is 51125051. The reversal of 51125040 is 4052115.

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

It is a super-2 number, since 2×51125040² = 5227539430003200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 9675 + ... + 13994.

It is an arithmetic number, because the mean of its divisors is an integer number (2201310).

Almost surely, 2^51125040 is an apocalyptic number.

It is an amenable number.

51125040 is an abundant number, since it is smaller than the sum of its proper divisors (124979760).

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

51125040 is a wasteful number, since it uses less digits than its factorization.

51125040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23691 (or 23679 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51125040 is about 7150.1776201714. The cubic root of 51125040 is about 371.1458028161.

Adding to 51125040 its reverse (4052115), we get a palindrome (55177155).

The spelling of 51125040 in words is "fifty-one million, one hundred twenty-five thousand, forty".