51098868 has 36 divisors (see below), whose sum is σ = 129564708. Its totient is φ = 16980480.

The previous prime is 51098863. The next prime is 51098869. The reversal of 51098868 is 86889015.

It can be written as a sum of positive squares in 2 ways, for example, as 10419984 + 40678884 = 3228^2 + 6378^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×51098868² = 5222188621762848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51098863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10698 + ... + 14718.

Almost surely, 2^51098868 is an apocalyptic number.

It is an amenable number.

51098868 is an abundant number, since it is smaller than the sum of its proper divisors (78465840).

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

51098868 is a wasteful number, since it uses less digits than its factorization.

51098868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384 (or 4379 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 51098868 is about 7148.3472215611. The cubic root of 51098868 is about 371.0824595179.

The spelling of 51098868 in words is "fifty-one million, ninety-eight thousand, eight hundred sixty-eight".