75621605 has 6 divisors (see below), whose sum is σ = 90769266. Its totient is φ = 60481728.

The previous prime is 75621571. The next prime is 75621607. The reversal of 75621605 is 50612657.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20994724 + 54626881 = 4582^2 + 7391^2 .

It is not a de Polignac number, because 75621605 - 2¹⁴ = 75605221 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 (75621607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17501 + ... + 21389.

It is an arithmetic number, because the mean of its divisors is an integer number (15128211).

Almost surely, 2^75621605 is an apocalyptic number.

It is an amenable number.

75621605 is a deficient number, since it is larger than the sum of its proper divisors (15147661).

75621605 is an frugal number, since it uses more digits than its factorization.

75621605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7783 (or 3894 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 75621605 is about 8696.0683644967. The cubic root of 75621605 is about 422.8781996878.

The spelling of 75621605 in words is "seventy-five million, six hundred twenty-one thousand, six hundred five".