51720498 has 32 divisors (see below), whose sum is σ = 115536000. Its totient is φ = 17149968.

The previous prime is 51720463. The next prime is 51720499. The reversal of 51720498 is 89402715.

It is not an unprimeable number, because it can be changed into a prime (51720499) 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, 8340 + ... + 13152.

It is an arithmetic number, because the mean of its divisors is an integer number (3610500).

Almost surely, 2^51720498 is an apocalyptic number.

51720498 is an abundant number, since it is smaller than the sum of its proper divisors (63815502).

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

51720498 is a wasteful number, since it uses less digits than its factorization.

51720498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023 (or 5017 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 51720498 is about 7191.6964618927. The cubic root of 51720498 is about 372.5811675442.

The spelling of 51720498 in words is "fifty-one million, seven hundred twenty thousand, four hundred ninety-eight".