721464040 has 64 divisors (see below), whose sum is σ = 1797370560. Its totient is φ = 258424320.

The previous prime is 721464011. The next prime is 721464043. The reversal of 721464040 is 40464127.

It is a super-2 number, since 2×721464040² = 1041020722026243200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721464043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17244 + ... + 41716.

It is an arithmetic number, because the mean of its divisors is an integer number (28083915).

Almost surely, 2^721464040 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 721464040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (898685280).

721464040 is an abundant number, since it is smaller than the sum of its proper divisors (1075906520).

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

721464040 is a wasteful number, since it uses less digits than its factorization.

721464040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24562 (or 24558 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 721464040 is about 26860.0826506547. The cubic root of 721464040 is about 896.8880339254. Note that the first 3 decimals are identical.

The spelling of 721464040 in words is "seven hundred twenty-one million, four hundred sixty-four thousand, forty".