7640513 has 4 divisors (see below), whose sum is σ = 7653828. Its totient is φ = 7627200.

The previous prime is 7640483. The next prime is 7640519. The reversal of 7640513 is 3150467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3150467 = 61 ⋅51647.

It can be written as a sum of positive squares in 2 ways, for example, as 6880129 + 760384 = 2623^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 7640513 - 2¹⁸ = 7378369 is a prime.

It is a Duffinian number.

It is a Curzon number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5756 + ... + 6957.

It is an arithmetic number, because the mean of its divisors is an integer number (1913457).

Almost surely, 2^7640513 is an apocalyptic number.

It is an amenable number.

7640513 is a deficient number, since it is larger than the sum of its proper divisors (13315).

7640513 is a wasteful number, since it uses less digits than its factorization.

7640513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13314.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 7640513 is about 2764.1477891025. The cubic root of 7640513 is about 196.9582482572.

The spelling of 7640513 in words is "seven million, six hundred forty thousand, five hundred thirteen".