74212749 has 24 divisors (see below), whose sum is σ = 117036920. Its totient is φ = 45038592.

The previous prime is 74212703. The next prime is 74212771. The reversal of 74212749 is 94721247.

It can be written as a sum of positive squares in 4 ways, for example, as 14768649 + 59444100 = 3843^2 + 7710^2 .

It is not a de Polignac number, because 74212749 - 2¹¹ = 74210701 is a prime.

It is a super-2 number, since 2×74212749² = 11015064228274002, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74212799) 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 in 23 ways as a sum of consecutive naturals, for example, 4197 + ... + 12885.

Almost surely, 2^74212749 is an apocalyptic number.

It is an amenable number.

74212749 is a deficient number, since it is larger than the sum of its proper divisors (42824171).

74212749 is a wasteful number, since it uses less digits than its factorization.

74212749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8781 (or 8778 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 74212749 is about 8614.6821763777. The cubic root of 74212749 is about 420.2355991084.

The spelling of 74212749 in words is "seventy-four million, two hundred twelve thousand, seven hundred forty-nine".