7681749 has 4 divisors (see below), whose sum is σ = 10242336. Its totient is φ = 5121164.

The previous prime is 7681711. The next prime is 7681753. The reversal of 7681749 is 9471867.

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 not a de Polignac number, because 7681749 - 2⁸ = 7681493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7681749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7681789) 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, 1280289 + ... + 1280294.

It is an arithmetic number, because the mean of its divisors is an integer number (2560584).

Almost surely, 2^7681749 is an apocalyptic number.

It is an amenable number.

7681749 is a deficient number, since it is larger than the sum of its proper divisors (2560587).

7681749 is a wasteful number, since it uses less digits than its factorization.

7681749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560586.

The product of its digits is 84672, while the sum is 42.

The square root of 7681749 is about 2771.5968321529. The cubic root of 7681749 is about 197.3119419101.

The spelling of 7681749 in words is "seven million, six hundred eighty-one thousand, seven hundred forty-nine".