74282721457 has 8 divisors (see below), whose sum is σ = 84900962432. Its totient is φ = 63666086400.

The previous prime is 74282721419. The next prime is 74282721481. The reversal of 74282721457 is 75412728247.

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

It is a de Polignac number, because none of the positive numbers 2^k-74282721457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74282721457.

It is not an unprimeable number, because it can be changed into a prime (74282724457) 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, 300669 + ... + 488842.

It is an arithmetic number, because the mean of its divisors is an integer number (10612620304).

Almost surely, 2^74282721457 is an apocalyptic number.

It is an amenable number.

74282721457 is a deficient number, since it is larger than the sum of its proper divisors (10618240975).

74282721457 is a wasteful number, since it uses less digits than its factorization.

74282721457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802959.

The product of its digits is 1756160, while the sum is 49.

The spelling of 74282721457 in words is "seventy-four billion, two hundred eighty-two million, seven hundred twenty-one thousand, four hundred fifty-seven".