87164778 has 16 divisors (see below), whose sum is σ = 180341280. Its totient is φ = 28052976.

The previous prime is 87164773. The next prime is 87164801. The reversal of 87164778 is 87746178.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87164773) 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, 250300 + ... + 250647.

It is an arithmetic number, because the mean of its divisors is an integer number (11271330).

Almost surely, 2^87164778 is an apocalyptic number.

87164778 is an abundant number, since it is smaller than the sum of its proper divisors (93176502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87164778 is a wasteful number, since it uses less digits than its factorization.

87164778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500981.

The product of its digits is 526848, while the sum is 48.

The square root of 87164778 is about 9336.2079025694. The cubic root of 87164778 is about 443.3843325480.

The spelling of 87164778 in words is "eighty-seven million, one hundred sixty-four thousand, seven hundred seventy-eight".