623761 has 8 divisors (see below), whose sum is σ = 654120. Its totient is φ = 594048.

The previous prime is 623759. The next prime is 623767. The reversal of 623761 is 167326.

It can be written as a sum of positive squares in 4 ways, for example, as 70225 + 553536 = 265^2 + 744^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 623761 - 2¹ = 623759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3895 + ... + 4051.

It is an arithmetic number, because the mean of its divisors is an integer number (81765).

2⁶²³⁷⁶¹ is an apocalyptic number.

It is an amenable number.

623761 is a deficient number, since it is larger than the sum of its proper divisors (30359).

623761 is a wasteful number, since it uses less digits than its factorization.

623761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323.

The product of its digits is 1512, while the sum is 25.

The square root of 623761 is about 789.7854138942. The cubic root of 623761 is about 85.4422623538.

The spelling of 623761 in words is "six hundred twenty-three thousand, seven hundred sixty-one".