45645781 has 8 divisors (see below), whose sum is σ = 46036224. Its totient is φ = 45257520.

The previous prime is 45645779. The next prime is 45645791. The reversal of 45645781 is 18754654.

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 45645781 - 2¹ = 45645779 is a prime.

It is a super-2 number, since 2×45645781² = 4167074646199922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45645701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98356 + ... + 98818.

It is an arithmetic number, because the mean of its divisors is an integer number (5754528).

Almost surely, 2^45645781 is an apocalyptic number.

It is an amenable number.

45645781 is a deficient number, since it is larger than the sum of its proper divisors (390443).

45645781 is a wasteful number, since it uses less digits than its factorization.

45645781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091.

The product of its digits is 134400, while the sum is 40.

The square root of 45645781 is about 6756.1661465657. The cubic root of 45645781 is about 357.3827179795.

The spelling of 45645781 in words is "forty-five million, six hundred forty-five thousand, seven hundred eighty-one".