7621661 has 8 divisors (see below), whose sum is σ = 8242560. Its totient is φ = 7019968.

The previous prime is 7621643. The next prime is 7621673. The reversal of 7621661 is 1661267.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7621661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7621681) 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 7 ways as a sum of consecutive naturals, for example, 3971 + ... + 5568.

It is an arithmetic number, because the mean of its divisors is an integer number (1030320).

Almost surely, 2^7621661 is an apocalyptic number.

It is an amenable number.

7621661 is a deficient number, since it is larger than the sum of its proper divisors (620899).

7621661 is a wasteful number, since it uses less digits than its factorization.

7621661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9603.

The product of its digits is 3024, while the sum is 29.

The square root of 7621661 is about 2760.7355903817. The cubic root of 7621661 is about 196.7961249843.

The spelling of 7621661 in words is "seven million, six hundred twenty-one thousand, six hundred sixty-one".