45280721 has 8 divisors (see below), whose sum is σ = 47317824. Its totient is φ = 43249360.

The previous prime is 45280717. The next prime is 45280751. The reversal of 45280721 is 12708254.

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

It is a cyclic number.

It is not a de Polignac number, because 45280721 - 2² = 45280717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45280751) 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, 26330 + ... + 27996.

It is an arithmetic number, because the mean of its divisors is an integer number (5914728).

Almost surely, 2^45280721 is an apocalyptic number.

It is an amenable number.

45280721 is a deficient number, since it is larger than the sum of its proper divisors (2037103).

45280721 is a wasteful number, since it uses less digits than its factorization.

45280721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 45280721 is about 6729.0951100427. The cubic root of 45280721 is about 356.4274234318.

Adding to 45280721 its reverse (12708254), we get a palindrome (57988975).

The spelling of 45280721 in words is "forty-five million, two hundred eighty thousand, seven hundred twenty-one".