721415984 has 20 divisors (see below), whose sum is σ = 1399471440. Its totient is φ = 360262080.

The previous prime is 721415983. The next prime is 721415987. The reversal of 721415984 is 489514127.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (721415983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14324 + ... + 40595.

It is an arithmetic number, because the mean of its divisors is an integer number (69973572).

Almost surely, 2^721415984 is an apocalyptic number.

It is an amenable number.

721415984 is a deficient number, since it is larger than the sum of its proper divisors (678055456).

721415984 is a wasteful number, since it uses less digits than its factorization.

721415984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55748 (or 55742 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 721415984 is about 26859.1880741023. The cubic root of 721415984 is about 896.8681198775.

It can be divided in two parts, 721415 and 984, that multiplied together give a triangular number (709872360 = T₃₇₆₇₉).

The spelling of 721415984 in words is "seven hundred twenty-one million, four hundred fifteen thousand, nine hundred eighty-four".