74743647 has 8 divisors (see below), whose sum is σ = 108718080. Its totient is φ = 45299160.

The previous prime is 74743637. The next prime is 74743649. The reversal of 74743647 is 74634747.

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

It is not a de Polignac number, because 74743647 - 2⁷ = 74743519 is a prime.

It is a super-2 number, since 2×74743647² = 11173225533721218, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 74743599 and 74743608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74743649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1132447 + ... + 1132512.

It is an arithmetic number, because the mean of its divisors is an integer number (13589760).

Almost surely, 2^74743647 is an apocalyptic number.

74743647 is a deficient number, since it is larger than the sum of its proper divisors (33974433).

74743647 is a wasteful number, since it uses less digits than its factorization.

74743647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264973.

The product of its digits is 395136, while the sum is 42.

The square root of 74743647 is about 8645.4408216123. The cubic root of 74743647 is about 421.2353030765.

Subtracting from 74743647 its reverse (74634747), we obtain a square (108900 = 330²).

The spelling of 74743647 in words is "seventy-four million, seven hundred forty-three thousand, six hundred forty-seven".