7890990987 has 16 divisors (see below), whose sum is σ = 11479327488. Its totient is φ = 4781784480.

The previous prime is 7890990977. The next prime is 7890991021.

7890990987 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7890990987 - 2¹⁶ = 7890925451 is a prime.

It is a super-4 number, since 4×7890990987⁴ (a number of 41 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (7890990967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397633 + ... + 417005.

It is an arithmetic number, because the mean of its divisors is an integer number (717457968).

Almost surely, 2^7890990987 is an apocalyptic number.

7890990987 is a deficient number, since it is larger than the sum of its proper divisors (3588336501).

7890990987 is a wasteful number, since it uses less digits than its factorization.

7890990987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31730.

The product of its (nonzero) digits is 20575296, while the sum is 66.

The square root of 7890990987 is about 88831.2500587490. The cubic root of 7890990987 is about 1990.8743400791.

The spelling of 7890990987 in words is "seven billion, eight hundred ninety million, nine hundred ninety thousand, nine hundred eighty-seven".