87681994 has 8 divisors (see below), whose sum is σ = 131570820. Its totient is φ = 43825056.

The previous prime is 87681991. The next prime is 87682009. The reversal of 87681994 is 49918678.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86025625 + 1656369 = 9275^2 + 1287^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (87681991) 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, 862 + ... + 13270.

Almost surely, 2^87681994 is an apocalyptic number.

87681994 is a deficient number, since it is larger than the sum of its proper divisors (43888826).

87681994 is a wasteful number, since it uses less digits than its factorization.

87681994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15944.

The product of its digits is 870912, while the sum is 52.

The square root of 87681994 is about 9363.8664022934. The cubic root of 87681994 is about 444.2595842921.

The spelling of 87681994 in words is "eighty-seven million, six hundred eighty-one thousand, nine hundred ninety-four".