7640641 has 4 divisors (see below), whose sum is σ = 8042800. Its totient is φ = 7238484.

The previous prime is 7640621. The next prime is 7640681. The reversal of 7640641 is 1460467.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7640641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7640621) 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, 201051 + ... + 201088.

It is an arithmetic number, because the mean of its divisors is an integer number (2010700).

Almost surely, 2^7640641 is an apocalyptic number.

It is an amenable number.

7640641 is a deficient number, since it is larger than the sum of its proper divisors (402159).

7640641 is a wasteful number, since it uses less digits than its factorization.

7640641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402158.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 7640641 is about 2764.1709426155. The cubic root of 7640641 is about 196.9593481185.

It can be divided in two parts, 7640 and 641, that added together give a square (8281 = 91²).

The spelling of 7640641 in words is "seven million, six hundred forty thousand, six hundred forty-one".