7641621 has 48 divisors (see below), whose sum is σ = 12841920. Its totient is φ = 4510080.

The previous prime is 7641611. The next prime is 7641637. The reversal of 7641621 is 1261467.

It is not a de Polignac number, because 7641621 - 2⁷ = 7641493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7641611) 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 47 ways as a sum of consecutive naturals, for example, 129490 + ... + 129548.

It is an arithmetic number, because the mean of its divisors is an integer number (267540).

Almost surely, 2^7641621 is an apocalyptic number.

It is an amenable number.

7641621 is a deficient number, since it is larger than the sum of its proper divisors (5200299).

7641621 is a wasteful number, since it uses less digits than its factorization.

7641621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 116 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 7641621 is about 2764.3482052737. The cubic root of 7641621 is about 196.9677685250.

It can be divided in two parts, 76416 and 21, that multiplied together give a triangular number (1604736 = T₁₇₉₁).

The spelling of 7641621 in words is "seven million, six hundred forty-one thousand, six hundred twenty-one".