7661643 has 8 divisors (see below), whose sum is σ = 11144256. Its totient is φ = 4643400.

The previous prime is 7661639. The next prime is 7661663. The reversal of 7661643 is 3461667.

7661643 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7661643 - 2² = 7661639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 232171 = 7661643 / (7 + 6 + 6 + 1 + 6 + 4 + 3).

It is a d-powerful number, because it can be written as 7⁴ + 6⁶ + 6⁸ + 1 + 6⁸ + 4¹¹ + 3¹⁰ .

7661643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7661603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116053 + ... + 116118.

It is an arithmetic number, because the mean of its divisors is an integer number (1393032).

Almost surely, 2^7661643 is an apocalyptic number.

7661643 is a deficient number, since it is larger than the sum of its proper divisors (3482613).

7661643 is a wasteful number, since it uses less digits than its factorization.

7661643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232185.

The product of its digits is 18144, while the sum is 33.

The square root of 7661643 is about 2767.9673047202. The cubic root of 7661643 is about 197.1396452053.

The spelling of 7661643 in words is "seven million, six hundred sixty-one thousand, six hundred forty-three".