51490698 has 64 divisors (see below), whose sum is σ = 123973632. Its totient is φ = 13939200.

The previous prime is 51490697. The next prime is 51490723. The reversal of 51490698 is 89609415.

51490698 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (51490697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145690 + ... + 146042.

It is an arithmetic number, because the mean of its divisors is an integer number (1937088).

Almost surely, 2^51490698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51490698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61986816).

51490698 is an abundant number, since it is smaller than the sum of its proper divisors (72482934).

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

51490698 is a wasteful number, since it uses less digits than its factorization.

51490698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 51490698 is about 7175.7019168859. The cubic root of 51490698 is about 372.0285415724.

The spelling of 51490698 in words is "fifty-one million, four hundred ninety thousand, six hundred ninety-eight".