51124890 has 32 divisors (see below), whose sum is σ = 126660096. Its totient is φ = 13193280.

The previous prime is 51124873. The next prime is 51124897. The reversal of 51124890 is 9842115.

It is a happy number.

It is a super-2 number, since 2×51124890² = 5227508755024200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (51124897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26557 + ... + 28416.

It is an arithmetic number, because the mean of its divisors is an integer number (3958128).

Almost surely, 2^51124890 is an apocalyptic number.

51124890 is an abundant number, since it is smaller than the sum of its proper divisors (75535206).

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

51124890 is a wasteful number, since it uses less digits than its factorization.

51124890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55014.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 51124890 is about 7150.1671309138. The cubic root of 51124890 is about 371.1454398373.

The spelling of 51124890 in words is "fifty-one million, one hundred twenty-four thousand, eight hundred ninety".