74640547 has 4 divisors (see below), whose sum is σ = 74660616. Its totient is φ = 74620480.

The previous prime is 74640539. The next prime is 74640571. The reversal of 74640547 is 74504647.

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

It is a cyclic number.

It is not a de Polignac number, because 74640547 - 2³ = 74640539 is a prime.

It is a super-2 number, since 2×74640547² = 11142422512918418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74644547) 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, 2638 + ... + 12499.

It is an arithmetic number, because the mean of its divisors is an integer number (18665154).

Almost surely, 2^74640547 is an apocalyptic number.

74640547 is a deficient number, since it is larger than the sum of its proper divisors (20069).

74640547 is a wasteful number, since it uses less digits than its factorization.

74640547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20068.

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 74640547 is about 8639.4760836523. The cubic root of 74640547 is about 421.0415325674.

The spelling of 74640547 in words is "seventy-four million, six hundred forty thousand, five hundred forty-seven".