74672821 has 2 divisors, whose sum is σ = 74672822. Its totient is φ = 74672820.

The previous prime is 74672803. The next prime is 74672827. The reversal of 74672821 is 12827647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68724100 + 5948721 = 8290^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 74672821 - 2¹⁵ = 74640053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74672827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37336410 + 37336411.

It is an arithmetic number, because the mean of its divisors is an integer number (37336411).

Almost surely, 2^74672821 is an apocalyptic number.

It is an amenable number.

74672821 is a deficient number, since it is larger than the sum of its proper divisors (1).

74672821 is an equidigital number, since it uses as much as digits as its factorization.

74672821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 37.

The square root of 74672821 is about 8641.3437033832. The cubic root of 74672821 is about 421.1022088659.

The spelling of 74672821 in words is "seventy-four million, six hundred seventy-two thousand, eight hundred twenty-one".