87721933 has 8 divisors (see below), whose sum is σ = 94952088. Its totient is φ = 80560704.

The previous prime is 87721913. The next prime is 87721973. The reversal of 87721933 is 33912778.

It can be written as a sum of positive squares in 4 ways, for example, as 10510564 + 77211369 = 3242^2 + 8787^2 .

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 87721933 - 2⁵ = 87721901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87721913) 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, 14566 + ... + 19687.

It is an arithmetic number, because the mean of its divisors is an integer number (11869011).

Almost surely, 2^87721933 is an apocalyptic number.

It is an amenable number.

87721933 is a deficient number, since it is larger than the sum of its proper divisors (7230155).

87721933 is a wasteful number, since it uses less digits than its factorization.

87721933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34463.

The product of its digits is 63504, while the sum is 40.

The square root of 87721933 is about 9365.9987721545. The cubic root of 87721933 is about 444.3270272162.

The spelling of 87721933 in words is "eighty-seven million, seven hundred twenty-one thousand, nine hundred thirty-three".