87670785 has 32 divisors (see below), whose sum is σ = 150232320. Its totient is φ = 43501568.

The previous prime is 87670763. The next prime is 87670861. The reversal of 87670785 is 58707678.

It is a cyclic number.

It is not a de Polignac number, because 87670785 - 2⁵ = 87670753 is a prime.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20764 + ... + 24626.

It is an arithmetic number, because the mean of its divisors is an integer number (4694760).

It is a Proth number, since it is equal to 5351 ⋅ 2¹⁴ + 1 and 5351 < 2¹⁴.

Almost surely, 2^87670785 is an apocalyptic number.

87670785 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

87670785 is a deficient number, since it is larger than the sum of its proper divisors (62561535).

87670785 is a wasteful number, since it uses less digits than its factorization.

87670785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977.

The product of its (nonzero) digits is 658560, while the sum is 48.

The square root of 87670785 is about 9363.2678590330. The cubic root of 87670785 is about 444.2406525530.

The spelling of 87670785 in words is "eighty-seven million, six hundred seventy thousand, seven hundred eighty-five".