45787681 has 4 divisors (see below), whose sum is σ = 48481092. Its totient is φ = 43094272.

The previous prime is 45787669. The next prime is 45787699. The reversal of 45787681 is 18678754.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13808656 + 31979025 = 3716^2 + 5655^2 .

It is a cyclic number.

It is not a de Polignac number, because 45787681 - 2²³ = 37399073 is a prime.

It is a super-2 number, since 2×45787681² = 4193023462715522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45787631) 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, 1346680 + ... + 1346713.

It is an arithmetic number, because the mean of its divisors is an integer number (12120273).

Almost surely, 2^45787681 is an apocalyptic number.

It is an amenable number.

45787681 is a deficient number, since it is larger than the sum of its proper divisors (2693411).

45787681 is a wasteful number, since it uses less digits than its factorization.

45787681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693410.

The product of its digits is 376320, while the sum is 46.

The square root of 45787681 is about 6766.6595155956. The cubic root of 45787681 is about 357.7526692776.

The spelling of 45787681 in words is "forty-five million, seven hundred eighty-seven thousand, six hundred eighty-one".