623730665 has 8 divisors (see below), whose sum is σ = 749101128. Its totient is φ = 498568320.

The previous prime is 623730649. The next prime is 623730677. The reversal of 623730665 is 566037326.

It can be written as a sum of positive squares in 4 ways, for example, as 76545001 + 547185664 = 8749^2 + 23392^2 .

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

It is not a de Polignac number, because 623730665 - 2⁴ = 623730649 is a prime.

It is a super-2 number, since 2×623730665² = 778079884922684450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45356 + ... + 57485.

It is an arithmetic number, because the mean of its divisors is an integer number (93637641).

Almost surely, 2^623730665 is an apocalyptic number.

It is an amenable number.

623730665 is a deficient number, since it is larger than the sum of its proper divisors (125370463).

623730665 is a wasteful number, since it uses less digits than its factorization.

623730665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104059.

The product of its (nonzero) digits is 136080, while the sum is 38.

The square root of 623730665 is about 24974.6003972036. The cubic root of 623730665 is about 854.4087724363.

The spelling of 623730665 in words is "six hundred twenty-three million, seven hundred thirty thousand, six hundred sixty-five".