87721704 has 160 divisors (see below), whose sum is σ = 285405120. Its totient is φ = 24655104.

The previous prime is 87721687. The next prime is 87721729. The reversal of 87721704 is 40712778.

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

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 376372 + ... + 376604.

It is an arithmetic number, because the mean of its divisors is an integer number (1783782).

Almost surely, 2^87721704 is an apocalyptic number.

87721704 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87721704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142702560).

87721704 is an abundant number, since it is smaller than the sum of its proper divisors (197683416).

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

87721704 is a wasteful number, since it uses less digits than its factorization.

87721704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 328 counting only the distinct ones).

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

The square root of 87721704 is about 9365.9865470755. The cubic root of 87721704 is about 444.3266405741.

The spelling of 87721704 in words is "eighty-seven million, seven hundred twenty-one thousand, seven hundred four".