87948009 has 12 divisors (see below), whose sum is σ = 127212852. Its totient is φ = 58550400.

The previous prime is 87947969. The next prime is 87948011. The reversal of 87948009 is 90084978.

It can be written as a sum of positive squares in 2 ways, for example, as 13505625 + 74442384 = 3675^2 + 8628^2 .

It is not a de Polignac number, because 87948009 - 2²⁰ = 86899433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87948059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 429 + ... + 13269.

It is an arithmetic number, because the mean of its divisors is an integer number (10601071).

Almost surely, 2^87948009 is an apocalyptic number.

It is an amenable number.

87948009 is a deficient number, since it is larger than the sum of its proper divisors (39264843).

87948009 is a wasteful number, since it uses less digits than its factorization.

87948009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13608 (or 13605 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 87948009 is about 9378.0599806143. The cubic root of 87948009 is about 444.7084046840.

The spelling of 87948009 in words is "eighty-seven million, nine hundred forty-eight thousand, nine".