87891145 has 8 divisors (see below), whose sum is σ = 105570504. Its totient is φ = 70245504.

The previous prime is 87891143. The next prime is 87891157. The reversal of 87891145 is 54119878.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6512704 + 81378441 = 2552^2 + 9021^2 .

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 87891145 - 2¹ = 87891143 is a prime.

It is a super-2 number, since 2×87891145² = 15449706738822050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87891143) 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, 2284 + ... + 13453.

It is an arithmetic number, because the mean of its divisors is an integer number (13196313).

Almost surely, 2^87891145 is an apocalyptic number.

It is an amenable number.

87891145 is a deficient number, since it is larger than the sum of its proper divisors (17679359).

87891145 is a wasteful number, since it uses less digits than its factorization.

87891145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16859.

The product of its digits is 80640, while the sum is 43.

The square root of 87891145 is about 9375.0277332923. The cubic root of 87891145 is about 444.6125398996.

The spelling of 87891145 in words is "eighty-seven million, eight hundred ninety-one thousand, one hundred forty-five".