723620 has 24 divisors (see below), whose sum is σ = 1539384. Its totient is φ = 285696.

The previous prime is 723617. The next prime is 723623. The reversal of 723620 is 26327.

723620 = 10² + 11² + ... + 129².

It is an interprime number because it is at equal distance from previous prime (723617) and next prime (723623).

It can be written as a sum of positive squares in 4 ways, for example, as 70756 + 652864 = 266^2 + 808^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 723592 and 723601.

It is not an unprimeable number, because it can be changed into a prime (723623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1754 + ... + 2126.

It is an arithmetic number, because the mean of its divisors is an integer number (64141).

2⁷²³⁶²⁰ is an apocalyptic number.

It is an amenable number.

723620 is an abundant number, since it is smaller than the sum of its proper divisors (815764).

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

723620 is a wasteful number, since it uses less digits than its factorization.

723620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 723620 is about 850.6585684045. The cubic root of 723620 is about 89.7780539390.

Adding to 723620 its reverse (26327), we get a palindrome (749947).

The spelling of 723620 in words is "seven hundred twenty-three thousand, six hundred twenty".