721477542 has 64 divisors (see below), whose sum is σ = 1512981504. Its totient is φ = 229190400.

The previous prime is 721477531. The next prime is 721477543. The reversal of 721477542 is 245774127.

721477542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×721477542² = 1041059687220723528, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 721477542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721477543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2079013 + ... + 2079359.

It is an arithmetic number, because the mean of its divisors is an integer number (23640336).

Almost surely, 2^721477542 is an apocalyptic number.

721477542 is an abundant number, since it is smaller than the sum of its proper divisors (791503962).

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

721477542 is a wasteful number, since it uses less digits than its factorization.

721477542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573.

The product of its digits is 109760, while the sum is 39.

The square root of 721477542 is about 26860.3339889883. Note that the first 3 decimals coincide. The cubic root of 721477542 is about 896.8936288943.

The spelling of 721477542 in words is "seven hundred twenty-one million, four hundred seventy-seven thousand, five hundred forty-two".