721858452 has 48 divisors (see below), whose sum is σ = 1931099520. Its totient is φ = 205587072.

The previous prime is 721858439. The next prime is 721858457. The reversal of 721858452 is 254858127.

721858452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721858457) 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, 13074 + ... + 40182.

It is an arithmetic number, because the mean of its divisors is an integer number (40231240).

Almost surely, 2^721858452 is an apocalyptic number.

It is an amenable number.

721858452 is an abundant number, since it is smaller than the sum of its proper divisors (1209241068).

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

721858452 is a wasteful number, since it uses less digits than its factorization.

721858452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27440 (or 27438 counting only the distinct ones).

The product of its digits is 179200, while the sum is 42.

The square root of 721858452 is about 26867.4236204367. The cubic root of 721858452 is about 897.0514419131.

The spelling of 721858452 in words is "seven hundred twenty-one million, eight hundred fifty-eight thousand, four hundred fifty-two".