721926464 has 112 divisors (see below), whose sum is σ = 1708586880. Its totient is φ = 296110080.

The previous prime is 721926463. The next prime is 721926467. The reversal of 721926464 is 464629127.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721926463) 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 15 ways as a sum of consecutive naturals, for example, 2351399 + ... + 2351705.

It is an arithmetic number, because the mean of its divisors is an integer number (15255240).

Almost surely, 2^721926464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721926464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (854293440).

721926464 is an abundant number, since it is smaller than the sum of its proper divisors (986660416).

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

721926464 is a wasteful number, since it uses less digits than its factorization.

721926464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 526 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 721926464 is about 26868.6892869749. The cubic root of 721926464 is about 897.0796138012.

The spelling of 721926464 in words is "seven hundred twenty-one million, nine hundred twenty-six thousand, four hundred sixty-four".