637649898 has 8 divisors (see below), whose sum is σ = 1275299808. Its totient is φ = 212549964.

The previous prime is 637649869. The next prime is 637649911. The reversal of 637649898 is 898946736.

It is a sphenic number, since it is the product of 3 distinct primes.

637649898 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 53137486 + ... + 53137497.

It is an arithmetic number, because the mean of its divisors is an integer number (159412476).

Almost surely, 2^637649898 is an apocalyptic number.

637649898 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

637649898 is a wasteful number, since it uses less digits than its factorization.

637649898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106274988.

The product of its digits is 15676416, while the sum is 60.

The square root of 637649898 is about 25251.7305941593. The cubic root of 637649898 is about 860.7177611605.

The spelling of 637649898 in words is "six hundred thirty-seven million, six hundred forty-nine thousand, eight hundred ninety-eight".