74400749 has 4 divisors (see below), whose sum is σ = 74463900. Its totient is φ = 74337600.

The previous prime is 74400743. The next prime is 74400757. The reversal of 74400749 is 94700447.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15264649 + 59136100 = 3907^2 + 7690^2 .

It is a cyclic number.

It is not a de Polignac number, because 74400749 - 2⁸ = 74400493 is a prime.

It is a super-2 number, since 2×74400749² = 11070942903522002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74400743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29774 + ... + 32175.

It is an arithmetic number, because the mean of its divisors is an integer number (18615975).

Almost surely, 2^74400749 is an apocalyptic number.

It is an amenable number.

74400749 is a deficient number, since it is larger than the sum of its proper divisors (63151).

74400749 is a wasteful number, since it uses less digits than its factorization.

74400749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63150.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 74400749 is about 8625.5868785840. The cubic root of 74400749 is about 420.5901548718.

The spelling of 74400749 in words is "seventy-four million, four hundred thousand, seven hundred forty-nine".