87147720 has 192 divisors, whose sum is σ = 315057600. Its totient is φ = 20712960.

The previous prime is 87147707. The next prime is 87147751. The reversal of 87147720 is 2774178.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 233454 + ... + 233826.

It is an arithmetic number, because the mean of its divisors is an integer number (1640925).

Almost surely, 2^87147720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87147720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157528800).

87147720 is an abundant number, since it is smaller than the sum of its proper divisors (227909880).

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

87147720 is a wasteful number, since it uses less digits than its factorization.

87147720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 87147720 is about 9335.2943178027. The cubic root of 87147720 is about 443.3554074724.

The spelling of 87147720 in words is "eighty-seven million, one hundred forty-seven thousand, seven hundred twenty".