45857781 has 12 divisors (see below), whose sum is σ = 66350700. Its totient is φ = 30520320.

The previous prime is 45857767. The next prime is 45857813. The reversal of 45857781 is 18775854.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 32832900 + 13024881 = 5730^2 + 3609^2 .

It is not a de Polignac number, because 45857781 - 2²⁵ = 12303349 is a prime.

It is a super-4 number, since 4×45857781⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45857701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1795 + ... + 9743.

It is an arithmetic number, because the mean of its divisors is an integer number (5529225).

Almost surely, 2^45857781 is an apocalyptic number.

It is an amenable number.

45857781 is a deficient number, since it is larger than the sum of its proper divisors (20492919).

45857781 is a wasteful number, since it uses less digits than its factorization.

45857781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8596 (or 8593 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 45857781 is about 6771.8373429964. The cubic root of 45857781 is about 357.9351468512.

The spelling of 45857781 in words is "forty-five million, eight hundred fifty-seven thousand, seven hundred eighty-one".