51990498 has 120 divisors (see below), whose sum is σ = 141622272. Its totient is φ = 13961808.

The previous prime is 51990481. The next prime is 51990529. The reversal of 51990498 is 89409915.

51990498 is a `hidden beast` number, since 519 + 90 + 49 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 409311 + ... + 409437.

Almost surely, 2^51990498 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51990498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70811136).

51990498 is an abundant number, since it is smaller than the sum of its proper divisors (89631774).

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

51990498 is a wasteful number, since it uses less digits than its factorization.

51990498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 51990498 is about 7210.4436756693. The cubic root of 51990498 is about 373.2283794756.

The spelling of 51990498 in words is "fifty-one million, nine hundred ninety thousand, four hundred ninety-eight".