87961766 has 4 divisors (see below), whose sum is σ = 131942652. Its totient is φ = 43980882.

The previous prime is 87961763. The next prime is 87961771. The reversal of 87961766 is 66716978.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66716978 = 2 ⋅33358489.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87961763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21990440 + ... + 21990443.

It is an arithmetic number, because the mean of its divisors is an integer number (32985663).

Almost surely, 2^87961766 is an apocalyptic number.

87961766 is a deficient number, since it is larger than the sum of its proper divisors (43980886).

87961766 is a wasteful number, since it uses less digits than its factorization.

87961766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43980885.

The product of its digits is 762048, while the sum is 50.

The square root of 87961766 is about 9378.7934191984. The cubic root of 87961766 is about 444.7315908619.

The spelling of 87961766 in words is "eighty-seven million, nine hundred sixty-one thousand, seven hundred sixty-six".