7981566 has 32 divisors (see below), whose sum is σ = 16571040. Its totient is φ = 2560896.

The previous prime is 7981553. The next prime is 7981591. The reversal of 7981566 is 6651897.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34740 + ... + 34968.

It is an arithmetic number, because the mean of its divisors is an integer number (517845).

Almost surely, 2^7981566 is an apocalyptic number.

7981566 is an abundant number, since it is smaller than the sum of its proper divisors (8589474).

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

7981566 is a wasteful number, since it uses less digits than its factorization.

7981566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428.

The product of its digits is 90720, while the sum is 42.

The square root of 7981566 is about 2825.1665437634. The cubic root of 7981566 is about 199.8462651917.

The spelling of 7981566 in words is "seven million, nine hundred eighty-one thousand, five hundred sixty-six".