7642991 has 4 divisors (see below), whose sum is σ = 7654152. Its totient is φ = 7631832.

The previous prime is 7642963. The next prime is 7643017. The reversal of 7642991 is 1992467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1992467 = 23 ⋅86629.

It is a cyclic number.

It is not a de Polignac number, because 7642991 - 2¹⁰ = 7641967 is a prime.

It is a super-2 number, since 2×7642991² = 116830622852162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7642931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4481 + ... + 5946.

It is an arithmetic number, because the mean of its divisors is an integer number (1913538).

Almost surely, 2^7642991 is an apocalyptic number.

7642991 is a deficient number, since it is larger than the sum of its proper divisors (11161).

7642991 is a wasteful number, since it uses less digits than its factorization.

7642991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11160.

The product of its digits is 27216, while the sum is 38.

The square root of 7642991 is about 2764.5959921840. The cubic root of 7642991 is about 196.9795387030.

The spelling of 7642991 in words is "seven million, six hundred forty-two thousand, nine hundred ninety-one".