87717766 has 4 divisors (see below), whose sum is σ = 131576652. Its totient is φ = 43858882.

The previous prime is 87717733. The next prime is 87717781. The reversal of 87717766 is 66771778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66771778 = 2 ⋅33385889.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21929440 + ... + 21929443.

It is an arithmetic number, because the mean of its divisors is an integer number (32894163).

Almost surely, 2^87717766 is an apocalyptic number.

87717766 is a deficient number, since it is larger than the sum of its proper divisors (43858886).

87717766 is a wasteful number, since it uses less digits than its factorization.

87717766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43858885.

The product of its digits is 691488, while the sum is 49.

The square root of 87717766 is about 9365.7763159281. The cubic root of 87717766 is about 444.3199915754.

The spelling of 87717766 in words is "eighty-seven million, seven hundred seventeen thousand, seven hundred sixty-six".