74478997 has 2 divisors, whose sum is σ = 74478998. Its totient is φ = 74478996.

The previous prime is 74478983. The next prime is 74479003. The reversal of 74478997 is 79987447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45037521 + 29441476 = 6711^2 + 5426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74478997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74478947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37239498 + 37239499.

It is an arithmetic number, because the mean of its divisors is an integer number (37239499).

Almost surely, 2^74478997 is an apocalyptic number.

It is an amenable number.

74478997 is a deficient number, since it is larger than the sum of its proper divisors (1).

74478997 is an equidigital number, since it uses as much as digits as its factorization.

74478997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 55.

The square root of 74478997 is about 8630.1214939304. The cubic root of 74478997 is about 420.7375494803.

The spelling of 74478997 in words is "seventy-four million, four hundred seventy-eight thousand, nine hundred ninety-seven".