87943805 has 16 divisors (see below), whose sum is σ = 115596720. Its totient is φ = 63931392.

The previous prime is 87943787. The next prime is 87943813. The reversal of 87943805 is 50834978.

It can be written as a sum of positive squares in 8 ways, for example, as 3193369 + 84750436 = 1787^2 + 9206^2 .

It is a cyclic number.

It is not a de Polignac number, because 87943805 - 2⁶ = 87943741 is a prime.

It is a super-2 number, since 2×87943805² = 15468225675756050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15374 + ... + 20303.

It is an arithmetic number, because the mean of its divisors is an integer number (7224795).

Almost surely, 2^87943805 is an apocalyptic number.

87943805 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

87943805 is a deficient number, since it is larger than the sum of its proper divisors (27652915).

87943805 is a wasteful number, since it uses less digits than its factorization.

87943805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35728.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 87943805 is about 9377.8358377613. The cubic root of 87943805 is about 444.7013187403.

The spelling of 87943805 in words is "eighty-seven million, nine hundred forty-three thousand, eight hundred five".