7640518 has 4 divisors (see below), whose sum is σ = 11460780. Its totient is φ = 3820258.

The previous prime is 7640483. The next prime is 7640519. The reversal of 7640518 is 8150467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8150467 = 13 ⋅626959.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 7640518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7640519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1910128 + ... + 1910131.

It is an arithmetic number, because the mean of its divisors is an integer number (2865195).

Almost surely, 2^7640518 is an apocalyptic number.

7640518 is a deficient number, since it is larger than the sum of its proper divisors (3820262).

7640518 is a wasteful number, since it uses less digits than its factorization.

7640518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820261.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 7640518 is about 2764.1486935402. The cubic root of 7640518 is about 196.9582912207.

The spelling of 7640518 in words is "seven million, six hundred forty thousand, five hundred eighteen".