423665778 has 32 divisors (see below), whose sum is σ = 882731520. Its totient is φ = 135406080.

The previous prime is 423665771. The next prime is 423665779. The reversal of 423665778 is 877566324.

It is a super-3 number, since 3×423665778³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (423665771) 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, 9826 + ... + 30722.

It is an arithmetic number, because the mean of its divisors is an integer number (27585360).

Almost surely, 2^423665778 is an apocalyptic number.

423665778 is an abundant number, since it is smaller than the sum of its proper divisors (459065742).

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

423665778 is a wasteful number, since it uses less digits than its factorization.

423665778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21042.

The product of its digits is 1693440, while the sum is 48.

The square root of 423665778 is about 20583.1430544511. The cubic root of 423665778 is about 751.0597037765.

The spelling of 423665778 in words is "four hundred twenty-three million, six hundred sixty-five thousand, seven hundred seventy-eight".