88661861 has 4 divisors (see below), whose sum is σ = 88730400. Its totient is φ = 88593324.

The previous prime is 88661857. The next prime is 88661869. The reversal of 88661861 is 16816688.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 88661861 - 2² = 88661857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88661869) 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, 32291 + ... + 34928.

It is an arithmetic number, because the mean of its divisors is an integer number (22182600).

It is a Poulet number, since it divides 2^88661860-1.

Almost surely, 2^88661861 is an apocalyptic number.

It is an amenable number.

88661861 is a deficient number, since it is larger than the sum of its proper divisors (68539).

88661861 is a wasteful number, since it uses less digits than its factorization.

88661861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68538.

The product of its digits is 110592, while the sum is 44.

The square root of 88661861 is about 9416.0427462921. The cubic root of 88661861 is about 445.9083595828.

The spelling of 88661861 in words is "eighty-eight million, six hundred sixty-one thousand, eight hundred sixty-one".