51490788 has 12 divisors (see below), whose sum is σ = 120145200. Its totient is φ = 17163592.

The previous prime is 51490787. The next prime is 51490799. The reversal of 51490788 is 88709415.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (51490781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145438 + ... + 2145461.

It is an arithmetic number, because the mean of its divisors is an integer number (10012100).

Almost surely, 2^51490788 is an apocalyptic number.

It is an amenable number.

51490788 is an abundant number, since it is smaller than the sum of its proper divisors (68654412).

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

51490788 is a wasteful number, since it uses less digits than its factorization.

51490788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290906 (or 4290904 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 51490788 is about 7175.7081880467. The cubic root of 51490788 is about 372.0287583271.

The spelling of 51490788 in words is "fifty-one million, four hundred ninety thousand, seven hundred eighty-eight".