81676987 has 8 divisors (see below), whose sum is σ = 94875872. Its totient is φ = 68860800.

The previous prime is 81676981. The next prime is 81677003. The reversal of 81676987 is 78967618.

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

It is a cyclic number.

It is not a de Polignac number, because 81676987 - 2¹⁵ = 81644219 is a prime.

It is a super-2 number, since 2×81676987² = 13342260410796338, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (81676981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95214 + ... + 96067.

It is an arithmetic number, because the mean of its divisors is an integer number (11859484).

Almost surely, 2^81676987 is an apocalyptic number.

81676987 is a deficient number, since it is larger than the sum of its proper divisors (13198885).

81676987 is a wasteful number, since it uses less digits than its factorization.

81676987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191349.

The product of its digits is 1016064, while the sum is 52.

The square root of 81676987 is about 9037.5321299567. The cubic root of 81676987 is about 433.8769409788.

The spelling of 81676987 in words is "eighty-one million, six hundred seventy-six thousand, nine hundred eighty-seven".