73678621 has 2 divisors, whose sum is σ = 73678622. Its totient is φ = 73678620.

The previous prime is 73678603. The next prime is 73678673. The reversal of 73678621 is 12687637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69722500 + 3956121 = 8350^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 73678621 - 2¹¹ = 73676573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73678601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36839310 + 36839311.

It is an arithmetic number, because the mean of its divisors is an integer number (36839311).

Almost surely, 2^73678621 is an apocalyptic number.

It is an amenable number.

73678621 is a deficient number, since it is larger than the sum of its proper divisors (1).

73678621 is an equidigital number, since it uses as much as digits as its factorization.

73678621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The square root of 73678621 is about 8583.6251665599. The cubic root of 73678621 is about 419.2249899061.

The spelling of 73678621 in words is "seventy-three million, six hundred seventy-eight thousand, six hundred twenty-one".