87067821 has 4 divisors (see below), whose sum is σ = 116090432. Its totient is φ = 58045212.

The previous prime is 87067807. The next prime is 87067837. The reversal of 87067821 is 12876078.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87067821 - 2⁵ = 87067789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87067821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87067891) 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, 14511301 + ... + 14511306.

It is an arithmetic number, because the mean of its divisors is an integer number (29022608).

Almost surely, 2^87067821 is an apocalyptic number.

It is an amenable number.

87067821 is a deficient number, since it is larger than the sum of its proper divisors (29022611).

87067821 is a wasteful number, since it uses less digits than its factorization.

87067821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29022610.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 87067821 is about 9331.0139320440. The cubic root of 87067821 is about 443.2198732900.

The spelling of 87067821 in words is "eighty-seven million, sixty-seven thousand, eight hundred twenty-one".