7121703990 has 64 divisors (see below), whose sum is σ = 17364119040. Its totient is φ = 1868993280.

The previous prime is 7121703961. The next prime is 7121704049. The reversal of 7121703990 is 993071217.

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, 1311501 + ... + 1316919.

It is an arithmetic number, because the mean of its divisors is an integer number (271314360).

Almost surely, 2^7121703990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7121703990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8682059520).

7121703990 is an abundant number, since it is smaller than the sum of its proper divisors (10242415050).

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

7121703990 is a wasteful number, since it uses less digits than its factorization.

7121703990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6117.

The product of its (nonzero) digits is 23814, while the sum is 39.

The square root of 7121703990 is about 84390.1889439762. The cubic root of 7121703990 is about 1923.9538017860.

The spelling of 7121703990 in words is "seven billion, one hundred twenty-one million, seven hundred three thousand, nine hundred ninety".