51097920 has 224 divisors, whose sum is σ = 179076096. Its totient is φ = 12288000.

The previous prime is 51097901. The next prime is 51097933. The reversal of 51097920 is 2979015.

It is a super-2 number, since 2×51097920² = 5221994856652800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 505870 + ... + 505970.

Almost surely, 2^51097920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51097920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89538048).

51097920 is an abundant number, since it is smaller than the sum of its proper divisors (127978176).

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

51097920 is a wasteful number, since it uses less digits than its factorization.

51097920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 51097920 is about 7148.2809122194. The cubic root of 51097920 is about 371.0801646964.

The spelling of 51097920 in words is "fifty-one million, ninety-seven thousand, nine hundred twenty".