87405811 has 4 divisors (see below), whose sum is σ = 87459912. Its totient is φ = 87351712.

The previous prime is 87405793. The next prime is 87405817. The reversal of 87405811 is 11850478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11850478 = 2 ⋅5925239.

It is a cyclic number.

It is not a de Polignac number, because 87405811 - 2⁵ = 87405779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87405817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24550 + ... + 27883.

It is an arithmetic number, because the mean of its divisors is an integer number (21864978).

Almost surely, 2^87405811 is an apocalyptic number.

87405811 is a deficient number, since it is larger than the sum of its proper divisors (54101).

87405811 is a wasteful number, since it uses less digits than its factorization.

87405811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54100.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 87405811 is about 9349.1074975101. The cubic root of 87405811 is about 443.7926469361.

The spelling of 87405811 in words is "eighty-seven million, four hundred five thousand, eight hundred eleven".