87678381 has 16 divisors (see below), whose sum is σ = 133812224. Its totient is φ = 50024304.

The previous prime is 87678373. The next prime is 87678413. The reversal of 87678381 is 18387678.

It is not a de Polignac number, because 87678381 - 2³ = 87678373 is a prime.

It is a super-2 number, since 2×87678381² = 15374996989562322, which contains 22 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87678381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87678341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12396 + ... + 18138.

It is an arithmetic number, because the mean of its divisors is an integer number (8363264).

Almost surely, 2^87678381 is an apocalyptic number.

It is an amenable number.

87678381 is a deficient number, since it is larger than the sum of its proper divisors (46133843).

87678381 is a wasteful number, since it uses less digits than its factorization.

87678381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6480.

The product of its digits is 451584, while the sum is 48.

The square root of 87678381 is about 9363.6734778611. The cubic root of 87678381 is about 444.2534821957.

The spelling of 87678381 in words is "eighty-seven million, six hundred seventy-eight thousand, three hundred eighty-one".