74078621 has 2 divisors, whose sum is σ = 74078622. Its totient is φ = 74078620.

The previous prime is 74078591. The next prime is 74078647. The reversal of 74078621 is 12687047.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73788100 + 290521 = 8590^2 + 539^2 .

It is an emirp because it is prime and its reverse (12687047) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74078621 - 2²⁶ = 6969757 is a prime.

It is a Chen prime.

It is equal to p_4343498 and since 74078621 and 4343498 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74078671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37039310 + 37039311.

It is an arithmetic number, because the mean of its divisors is an integer number (37039311).

Almost surely, 2^74078621 is an apocalyptic number.

It is an amenable number.

74078621 is a deficient number, since it is larger than the sum of its proper divisors (1).

74078621 is an equidigital number, since it uses as much as digits as its factorization.

74078621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 74078621 is about 8606.8938067110. The cubic root of 74078621 is about 419.9822762740.

The spelling of 74078621 in words is "seventy-four million, seventy-eight thousand, six hundred twenty-one".