7662991 has 8 divisors (see below), whose sum is σ = 8888960. Its totient is φ = 6469848.

The previous prime is 7662961. The next prime is 7663009. The reversal of 7662991 is 1992667.

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

It is not a de Polignac number, because 7662991 - 2¹¹ = 7660943 is a prime.

It is a Duffinian number.

7662991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7662961) 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, 7701 + ... + 8638.

It is an arithmetic number, because the mean of its divisors is an integer number (1111120).

Almost surely, 2^7662991 is an apocalyptic number.

7662991 is a deficient number, since it is larger than the sum of its proper divisors (1225969).

7662991 is a wasteful number, since it uses less digits than its factorization.

7662991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16413.

The product of its digits is 40824, while the sum is 40.

The square root of 7662991 is about 2768.2107939967. The cubic root of 7662991 is about 197.1512062007.

The spelling of 7662991 in words is "seven million, six hundred sixty-two thousand, nine hundred ninety-one".