7900890557 has 8 divisors (see below), whose sum is σ = 9030136896. Its totient is φ = 6771781152.

The previous prime is 7900890533. The next prime is 7900890559. The reversal of 7900890557 is 7550980097.

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 7900890557 - 2⁶ = 7900890493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7900890559) 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, 173318 + ... + 214104.

It is an arithmetic number, because the mean of its divisors is an integer number (1128767112).

Almost surely, 2^7900890557 is an apocalyptic number.

It is an amenable number.

7900890557 is a deficient number, since it is larger than the sum of its proper divisors (1129246339).

7900890557 is a wasteful number, since it uses less digits than its factorization.

7900890557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68467.

The product of its (nonzero) digits is 793800, while the sum is 50.

The square root of 7900890557 is about 88886.9538065064. The cubic root of 7900890557 is about 1991.7065365182.

The spelling of 7900890557 in words is "seven billion, nine hundred million, eight hundred ninety thousand, five hundred fifty-seven".