47121961840 has 40 divisors (see below), whose sum is σ = 110878559568. Its totient is φ = 18621688320.

The previous prime is 47121961829. The next prime is 47121961849. The reversal of 47121961840 is 4816912174.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-5 number, since 5×47121961840⁵ (a number of 55 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47121961849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3541701 + ... + 3554980.

Almost surely, 2^47121961840 is an apocalyptic number.

47121961840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

47121961840 is an abundant number, since it is smaller than the sum of its proper divisors (63756597728).

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

47121961840 is a wasteful number, since it uses less digits than its factorization.

47121961840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7096777 (or 7096771 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 47121961840 in words is "forty-seven billion, one hundred twenty-one million, nine hundred sixty-one thousand, eight hundred forty".