4891996640 has 24 divisors (see below), whose sum is σ = 11557342440. Its totient is φ = 1956798592.

The previous prime is 4891996621. The next prime is 4891996649. The reversal of 4891996640 is 466991984.

It is a super-2 number, since 2×4891996640² = 47863262251542579200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4891996649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15287330 + ... + 15287649.

It is an arithmetic number, because the mean of its divisors is an integer number (481555935).

Almost surely, 2^4891996640 is an apocalyptic number.

4891996640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4891996640 is an abundant number, since it is smaller than the sum of its proper divisors (6665345800).

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

4891996640 is a wasteful number, since it uses less digits than its factorization.

4891996640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30574994 (or 30574986 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 56.

The square root of 4891996640 is about 69942.8097805629. The cubic root of 4891996640 is about 1697.5740067494.

The spelling of 4891996640 in words is "four billion, eight hundred ninety-one million, nine hundred ninety-six thousand, six hundred forty".