7640551 has 4 divisors (see below), whose sum is σ = 7654504. Its totient is φ = 7626600.

The previous prime is 7640519. The next prime is 7640579. The reversal of 7640551 is 1550467.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7640551 - 2⁵ = 7640519 is a prime.

It is a Duffinian number.

7640551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640351) 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, 6120 + ... + 7261.

It is an arithmetic number, because the mean of its divisors is an integer number (1913626).

Almost surely, 2^7640551 is an apocalyptic number.

7640551 is a deficient number, since it is larger than the sum of its proper divisors (13953).

7640551 is a wasteful number, since it uses less digits than its factorization.

7640551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13952.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 7640551 is about 2764.1546628219. The cubic root of 7640551 is about 196.9585747798.

The spelling of 7640551 in words is "seven million, six hundred forty thousand, five hundred fifty-one".