7988890 has 32 divisors (see below), whose sum is σ = 17700480. Its totient is φ = 2528064.

The previous prime is 7988857. The next prime is 7988899. The reversal of 7988890 is 988897.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7988899) 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, 3480 + ... + 5299.

It is an arithmetic number, because the mean of its divisors is an integer number (553140).

Almost surely, 2^7988890 is an apocalyptic number.

7988890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

7988890 is an abundant number, since it is smaller than the sum of its proper divisors (9711590).

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

7988890 is a wasteful number, since it uses less digits than its factorization.

7988890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8806.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 7988890 is about 2826.4624533151. The cubic root of 7988890 is about 199.9073737752.

The spelling of 7988890 in words is "seven million, nine hundred eighty-eight thousand, eight hundred ninety".