51090940 has 48 divisors (see below), whose sum is σ = 110369952. Its totient is φ = 19858176.

The previous prime is 51090937. The next prime is 51090971. The reversal of 51090940 is 4909015.

It is a super-2 number, since 2×51090940² = 5220568300167200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51090899 and 51090908.

It is a congruent number.

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, 166267 + ... + 166573.

It is an arithmetic number, because the mean of its divisors is an integer number (2299374).

Almost surely, 2^51090940 is an apocalyptic number.

It is an amenable number.

51090940 is an abundant number, since it is smaller than the sum of its proper divisors (59279012).

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

51090940 is a wasteful number, since it uses less digits than its factorization.

51090940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 51090940 is about 7147.7926662712. The cubic root of 51090940 is about 371.0632673517.

Adding to 51090940 its reverse (4909015), we get a palindrome (55999955).

The spelling of 51090940 in words is "fifty-one million, ninety thousand, nine hundred forty".