87211805 has 8 divisors (see below), whose sum is σ = 110162400. Its totient is φ = 66097296.

The previous prime is 87211799. The next prime is 87211807. The reversal of 87211805 is 50811278.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87211805 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87211807) 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, 458915 + ... + 459104.

It is an arithmetic number, because the mean of its divisors is an integer number (13770300).

Almost surely, 2^87211805 is an apocalyptic number.

It is an amenable number.

87211805 is a deficient number, since it is larger than the sum of its proper divisors (22950595).

87211805 is a wasteful number, since it uses less digits than its factorization.

87211805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918043.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 87211805 is about 9338.7260908541. The cubic root of 87211805 is about 443.4640562115.

The spelling of 87211805 in words is "eighty-seven million, two hundred eleven thousand, eight hundred five".