723215428 has 48 divisors (see below), whose sum is σ = 1451807280. Its totient is φ = 312274944.

The previous prime is 723215407. The next prime is 723215447. The reversal of 723215428 is 824512327.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 11819844 + 711395584 = 3438^2 + 26672^2 .

It is a super-4 number, since 4×723215428⁴ (a number of 37 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 723215393 and 723215402.

It is an unprimeable number.

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, 150568 + ... + 155296.

It is an arithmetic number, because the mean of its divisors is an integer number (30245985).

Almost surely, 2^723215428 is an apocalyptic number.

It is an amenable number.

723215428 is an abundant number, since it is smaller than the sum of its proper divisors (728591852).

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

723215428 is a wasteful number, since it uses less digits than its factorization.

723215428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936 (or 4934 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 723215428 is about 26892.6649478998. The cubic root of 723215428 is about 897.6131934628.

The spelling of 723215428 in words is "seven hundred twenty-three million, two hundred fifteen thousand, four hundred twenty-eight".