7120981890 has 384 divisors, whose sum is σ = 22095279360. Its totient is φ = 1628605440.

The previous prime is 7120981877. The next prime is 7120981919. The reversal of 7120981890 is 981890217.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 51977902 + ... + 51978038.

It is an arithmetic number, because the mean of its divisors is an integer number (57539790).

Almost surely, 2^7120981890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7120981890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11047639680).

7120981890 is an abundant number, since it is smaller than the sum of its proper divisors (14974297470).

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

7120981890 is a wasteful number, since it uses less digits than its factorization.

7120981890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 7120981890 is about 84385.9104945843. The cubic root of 7120981890 is about 1923.8887736224. Note that the first 3 decimals are identical.

The spelling of 7120981890 in words is "seven billion, one hundred twenty million, nine hundred eighty-one thousand, eight hundred ninety".