45427781 has 4 divisors (see below), whose sum is σ = 51917472. Its totient is φ = 38938092.

The previous prime is 45427771. The next prime is 45427799. The reversal of 45427781 is 18772454.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45427781 is a prime.

It is a super-2 number, since 2×45427781² = 4127366573167922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45427721) 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, 3244835 + ... + 3244848.

It is an arithmetic number, because the mean of its divisors is an integer number (12979368).

Almost surely, 2^45427781 is an apocalyptic number.

It is an amenable number.

45427781 is a deficient number, since it is larger than the sum of its proper divisors (6489691).

45427781 is an equidigital number, since it uses as much as digits as its factorization.

45427781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6489690.

The product of its digits is 62720, while the sum is 38.

The square root of 45427781 is about 6740.0134272863. The cubic root of 45427781 is about 356.8128676352.

The spelling of 45427781 in words is "forty-five million, four hundred twenty-seven thousand, seven hundred eighty-one".