84721792 has 16 divisors (see below), whose sum is σ = 168781950. Its totient is φ = 42360832.

The previous prime is 84721783. The next prime is 84721801. The reversal of 84721792 is 29712748.

It is an interprime number because it is at equal distance from previous prime (84721783) and next prime (84721801).

It can be written as a sum of positive squares in only one way, i.e., 52186176 + 32535616 = 7224^2 + 5704^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330817 + ... + 331072.

Almost surely, 2^84721792 is an apocalyptic number.

It is an amenable number.

84721792 is a deficient number, since it is larger than the sum of its proper divisors (84060158).

84721792 is an equidigital number, since it uses as much as digits as its factorization.

84721792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661903 (or 661891 counting only the distinct ones).

The product of its digits is 56448, while the sum is 40.

The square root of 84721792 is about 9204.4441439991. Note that the first 3 decimals coincide. The cubic root of 84721792 is about 439.2027436145.

The spelling of 84721792 in words is "eighty-four million, seven hundred twenty-one thousand, seven hundred ninety-two".