87889786 has 4 divisors (see below), whose sum is σ = 131834682. Its totient is φ = 43944892.

The previous prime is 87889771. The next prime is 87889787. The reversal of 87889786 is 68798878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68798878 = 2 ⋅34399439.

It can be written as a sum of positive squares in only one way, i.e., 79299025 + 8590761 = 8905^2 + 2931^2 .

It is a super-2 number, since 2×87889786² = 15449228966251592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87889787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21972445 + ... + 21972448.

Almost surely, 2^87889786 is an apocalyptic number.

87889786 is a deficient number, since it is larger than the sum of its proper divisors (43944896).

87889786 is a wasteful number, since it uses less digits than its factorization.

87889786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43944895.

The product of its digits is 10838016, while the sum is 61.

The square root of 87889786 is about 9374.9552532265. The cubic root of 87889786 is about 444.6102483090.

The spelling of 87889786 in words is "eighty-seven million, eight hundred eighty-nine thousand, seven hundred eighty-six".