87947261 has 8 divisors (see below), whose sum is σ = 91564344. Its totient is φ = 84395520.

The previous prime is 87947183. The next prime is 87947263. The reversal of 87947261 is 16274978.

It can be written as a sum of positive squares in 4 ways, for example, as 45306361 + 42640900 = 6731^2 + 6530^2 .

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

It is not a de Polignac number, because 87947261 - 2¹⁰ = 87946237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87947263) 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, 13580 + ... + 18981.

It is an arithmetic number, because the mean of its divisors is an integer number (11445543).

Almost surely, 2^87947261 is an apocalyptic number.

It is an amenable number.

87947261 is a deficient number, since it is larger than the sum of its proper divisors (3617083).

87947261 is a wasteful number, since it uses less digits than its factorization.

87947261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32671.

The product of its digits is 169344, while the sum is 44.

The square root of 87947261 is about 9378.0201002131. The cubic root of 87947261 is about 444.7071439284.

The spelling of 87947261 in words is "eighty-seven million, nine hundred forty-seven thousand, two hundred sixty-one".