87766645 has 4 divisors (see below), whose sum is σ = 105319980. Its totient is φ = 70213312.

The previous prime is 87766639. The next prime is 87766649. The reversal of 87766645 is 54666778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54666778 = 2 ⋅27333389.

It can be written as a sum of positive squares in 2 ways, for example, as 27688644 + 60078001 = 5262^2 + 7751^2 .

It is a cyclic number.

It is not a de Polignac number, because 87766645 - 2⁷ = 87766517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87766649) 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, 8776660 + ... + 8776669.

It is an arithmetic number, because the mean of its divisors is an integer number (26329995).

Almost surely, 2^87766645 is an apocalyptic number.

It is an amenable number.

87766645 is a deficient number, since it is larger than the sum of its proper divisors (17553335).

87766645 is a wasteful number, since it uses less digits than its factorization.

87766645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17553334.

The product of its digits is 1693440, while the sum is 49.

The square root of 87766645 is about 9368.3853998435. The cubic root of 87766645 is about 444.4025057765.

The spelling of 87766645 in words is "eighty-seven million, seven hundred sixty-six thousand, six hundred forty-five".