87491786 has 8 divisors (see below), whose sum is σ = 134438724. Its totient is φ = 42678880.

The previous prime is 87491779. The next prime is 87491819. The reversal of 87491786 is 68719478.

It can be written as a sum of positive squares in 2 ways, for example, as 86843761 + 648025 = 9319^2 + 805^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533405 + ... + 533568.

Almost surely, 2^87491786 is an apocalyptic number.

87491786 is a deficient number, since it is larger than the sum of its proper divisors (46946938).

87491786 is a wasteful number, since it uses less digits than its factorization.

87491786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067016.

The product of its digits is 677376, while the sum is 50.

The square root of 87491786 is about 9353.7043998621. The cubic root of 87491786 is about 443.9381085443.

The spelling of 87491786 in words is "eighty-seven million, four hundred ninety-one thousand, seven hundred eighty-six".