74971997 has 8 divisors (see below), whose sum is σ = 76395960. Its totient is φ = 73561600.

The previous prime is 74971987. The next prime is 74971999. The reversal of 74971997 is 79917947.

It can be written as a sum of positive squares in 4 ways, for example, as 23290276 + 51681721 = 4826^2 + 7189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74971997 - 2⁶ = 74971933 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 (74971999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8129 + ... + 14697.

It is an arithmetic number, because the mean of its divisors is an integer number (9549495).

Almost surely, 2^74971997 is an apocalyptic number.

It is an amenable number.

74971997 is a deficient number, since it is larger than the sum of its proper divisors (1423963).

74971997 is a wasteful number, since it uses less digits than its factorization.

74971997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6783.

The product of its digits is 1000188, while the sum is 53.

The square root of 74971997 is about 8658.6371329442. The cubic root of 74971997 is about 421.6638402396.

The spelling of 74971997 in words is "seventy-four million, nine hundred seventy-one thousand, nine hundred ninety-seven".