87709398 has 64 divisors (see below), whose sum is σ = 209640960. Its totient is φ = 23933952.

The previous prime is 87709387. The next prime is 87709423. The reversal of 87709398 is 89390778.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 87709398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129990 + ... + 130662.

It is an arithmetic number, because the mean of its divisors is an integer number (3275640).

Almost surely, 2^87709398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87709398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104820480).

87709398 is an abundant number, since it is smaller than the sum of its proper divisors (121931562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87709398 is a wasteful number, since it uses less digits than its factorization.

87709398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 87709398 is about 9365.3295724176. The cubic root of 87709398 is about 444.3058622145.

The spelling of 87709398 in words is "eighty-seven million, seven hundred nine thousand, three hundred ninety-eight".