87721484 has 6 divisors (see below), whose sum is σ = 153512604. Its totient is φ = 43860740.

The previous prime is 87721483. The next prime is 87721493. The reversal of 87721484 is 48412778.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (87721483) by changing a digit.

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 as a sum of consecutive naturals, namely, 10965182 + ... + 10965189.

It is an arithmetic number, because the mean of its divisors is an integer number (25585434).

Almost surely, 2^87721484 is an apocalyptic number.

It is an amenable number.

87721484 is a deficient number, since it is larger than the sum of its proper divisors (65791120).

87721484 is a wasteful number, since it uses less digits than its factorization.

87721484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21930375 (or 21930373 counting only the distinct ones).

The product of its digits is 100352, while the sum is 41.

The square root of 87721484 is about 9365.9748024431. The cubic root of 87721484 is about 444.3262691269.

The spelling of 87721484 in words is "eighty-seven million, seven hundred twenty-one thousand, four hundred eighty-four".