87721802 has 16 divisors (see below), whose sum is σ = 159226560. Its totient is φ = 35383488.

The previous prime is 87721801. The next prime is 87721807. The reversal of 87721802 is 20812778.

It is a super-2 number, since 2×87721802² = 15390229092254408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87721801) 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, 184052 + ... + 184527.

It is an arithmetic number, because the mean of its divisors is an integer number (9951660).

Almost surely, 2^87721802 is an apocalyptic number.

87721802 is a deficient number, since it is larger than the sum of its proper divisors (71504758).

87721802 is a wasteful number, since it uses less digits than its factorization.

87721802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368605.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 87721802 is about 9365.9917787707. The cubic root of 87721802 is about 444.3268060368.

The spelling of 87721802 in words is "eighty-seven million, seven hundred twenty-one thousand, eight hundred two".