87661449 has 6 divisors (see below), whose sum is σ = 126622106. Its totient is φ = 58440960.

The previous prime is 87661447. The next prime is 87661489. The reversal of 87661449 is 94416678.

It can be written as a sum of positive squares in only one way, i.e., 74701449 + 12960000 = 8643^2 + 3600^2 .

It is not a de Polignac number, because 87661449 - 2¹ = 87661447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87661447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4870072 + ... + 4870089.

Almost surely, 2^87661449 is an apocalyptic number.

It is an amenable number.

87661449 is a deficient number, since it is larger than the sum of its proper divisors (38960657).

87661449 is a wasteful number, since it uses less digits than its factorization.

87661449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9740167 (or 9740164 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 87661449 is about 9362.7693018679. The cubic root of 87661449 is about 444.2248830354.

The spelling of 87661449 in words is "eighty-seven million, six hundred sixty-one thousand, four hundred forty-nine".