72440457 has 8 divisors (see below), whose sum is σ = 96955584. Its totient is φ = 48109488.

The previous prime is 72440429. The next prime is 72440471. The reversal of 72440457 is 75404427.

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

It is not a de Polignac number, because 72440457 - 2¹¹ = 72438409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72440477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45118 + ... + 46695.

It is an arithmetic number, because the mean of its divisors is an integer number (12119448).

Almost surely, 2^72440457 is an apocalyptic number.

It is an amenable number.

72440457 is a deficient number, since it is larger than the sum of its proper divisors (24515127).

72440457 is a wasteful number, since it uses less digits than its factorization.

72440457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92079.

The product of its (nonzero) digits is 31360, while the sum is 33.

The square root of 72440457 is about 8511.1959794144. The cubic root of 72440457 is about 416.8633623491.

The spelling of 72440457 in words is "seventy-two million, four hundred forty thousand, four hundred fifty-seven".