87198644 has 24 divisors (see below), whose sum is σ = 174004488. Its totient is φ = 37877760.

The previous prime is 87198641. The next prime is 87198647. The reversal of 87198644 is 44689178.

It is an interprime number because it is at equal distance from previous prime (87198641) and next prime (87198647).

It can be written as a sum of positive squares in 4 ways, for example, as 13032100 + 74166544 = 3610^2 + 8612^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87198641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48437 + ... + 50204.

It is an arithmetic number, because the mean of its divisors is an integer number (7250187).

Almost surely, 2^87198644 is an apocalyptic number.

It is an amenable number.

87198644 is a deficient number, since it is larger than the sum of its proper divisors (86805844).

87198644 is a wasteful number, since it uses less digits than its factorization.

87198644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98675 (or 98673 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 87198644 is about 9338.0214178379. The cubic root of 87198644 is about 443.4417475953.

The spelling of 87198644 in words is "eighty-seven million, one hundred ninety-eight thousand, six hundred forty-four".