72074257 has 4 divisors (see below), whose sum is σ = 72292336. Its totient is φ = 71856180.

The previous prime is 72074243. The next prime is 72074273. The reversal of 72074257 is 75247027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75247027 = 167 ⋅450581.

It is a cyclic number.

It is not a de Polignac number, because 72074257 - 2¹⁹ = 71549969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72074227) 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, 108543 + ... + 109204.

It is an arithmetic number, because the mean of its divisors is an integer number (18073084).

Almost surely, 2^72074257 is an apocalyptic number.

It is an amenable number.

72074257 is a deficient number, since it is larger than the sum of its proper divisors (218079).

72074257 is a wasteful number, since it uses less digits than its factorization.

72074257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218078.

The product of its (nonzero) digits is 27440, while the sum is 34.

The square root of 72074257 is about 8489.6558823076. The cubic root of 72074257 is about 416.1597347159.

The spelling of 72074257 in words is "seventy-two million, seventy-four thousand, two hundred fifty-seven".