4961640840 has 128 divisors (see below), whose sum is σ = 16062278400. Its totient is φ = 1218862080.

The previous prime is 4961640833. The next prime is 4961640841. The reversal of 4961640840 is 480461694.

It is a junction number, because it is equal to n+sod(n) for n = 4961640792 and 4961640801.

It is not an unprimeable number, because it can be changed into a prime (4961640841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 841021 + ... + 846899.

It is an arithmetic number, because the mean of its divisors is an integer number (125486550).

Almost surely, 2^4961640840 is an apocalyptic number.

4961640840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4961640840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8031139200).

4961640840 is an abundant number, since it is smaller than the sum of its proper divisors (11100637560).

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

4961640840 is a wasteful number, since it uses less digits than its factorization.

4961640840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6447 (or 6443 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 4961640840 is about 70438.9156645671. The cubic root of 4961640840 is about 1705.5918333667.

The spelling of 4961640840 in words is "four billion, nine hundred sixty-one million, six hundred forty thousand, eight hundred forty".