990220107026731 has 32 divisors (see below), whose sum is σ = 1271943174205440. Its totient is φ = 751241437065504.

The previous prime is 990220107026713. The next prime is 990220107026749. The reversal of 990220107026731 is 137620701022099.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (990220107026713) and next prime (990220107026749).

It is not a de Polignac number, because 990220107026731 - 2⁵ = 990220107026699 is a prime.

It is a super-2 number, since 2×990220107026731² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990220107026701) 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, 3763904845 + ... + 3764167918.

It is an arithmetic number, because the mean of its divisors is an integer number (39748224193920).

Almost surely, 2^{990220107026731} is an apocalyptic number.

990220107026731 is a deficient number, since it is larger than the sum of its proper divisors (281723067178709).

990220107026731 is a wasteful number, since it uses less digits than its factorization.

990220107026731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528072855.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 990220107026731 in words is "nine hundred ninety trillion, two hundred twenty billion, one hundred seven million, twenty-six thousand, seven hundred thirty-one".