7890440987 has 8 divisors (see below), whose sum is σ = 9269888880. Its totient is φ = 6621348960.

The previous prime is 7890440903. The next prime is 7890440989.

7890440987 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7890440987 - 2⁸ = 7890440731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7890440989) 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, 27588812 + ... + 27589097.

It is an arithmetic number, because the mean of its divisors is an integer number (1158736110).

Almost surely, 2^7890440987 is an apocalyptic number.

7890440987 is a deficient number, since it is larger than the sum of its proper divisors (1379447893).

7890440987 is a wasteful number, since it uses less digits than its factorization.

7890440987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55177933.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The square root of 7890440987 is about 88828.1542474006. The cubic root of 7890440987 is about 1990.8280845315.

The spelling of 7890440987 in words is "seven billion, eight hundred ninety million, four hundred forty thousand, nine hundred eighty-seven".