74708257 has 4 divisors (see below), whose sum is σ = 80455060. Its totient is φ = 68961456.

The previous prime is 74708237. The next prime is 74708281. The reversal of 74708257 is 75280747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75280747 = 607 ⋅124021.

It can be written as a sum of positive squares in 2 ways, for example, as 44502241 + 30206016 = 6671^2 + 5496^2 .

It is a cyclic number.

It is not a de Polignac number, because 74708257 - 2⁷ = 74708129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74708237) 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, 2873382 + ... + 2873407.

It is an arithmetic number, because the mean of its divisors is an integer number (20113765).

Almost surely, 2^74708257 is an apocalyptic number.

It is an amenable number.

74708257 is a deficient number, since it is larger than the sum of its proper divisors (5746803).

74708257 is a wasteful number, since it uses less digits than its factorization.

74708257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5746802.

The product of its (nonzero) digits is 109760, while the sum is 40.

The square root of 74708257 is about 8643.3938357569. The cubic root of 74708257 is about 421.1688097070.

The spelling of 74708257 in words is "seventy-four million, seven hundred eight thousand, two hundred fifty-seven".