4891636590 has 64 divisors (see below), whose sum is σ = 12130186752. Its totient is φ = 1261769600.

The previous prime is 4891636577. The next prime is 4891636609. The reversal of 4891636590 is 956361984.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91225 + ... + 134555.

It is an arithmetic number, because the mean of its divisors is an integer number (189534168).

Almost surely, 2^4891636590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4891636590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6065093376).

4891636590 is an abundant number, since it is smaller than the sum of its proper divisors (7238550162).

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

4891636590 is a wasteful number, since it uses less digits than its factorization.

4891636590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43465.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 4891636590 is about 69940.2358446124. The cubic root of 4891636590 is about 1697.5323586889.

The spelling of 4891636590 in words is "four billion, eight hundred ninety-one million, six hundred thirty-six thousand, five hundred ninety".