23394449978 has 4 divisors (see below), whose sum is σ = 35091674970. Its totient is φ = 11697224988.

The previous prime is 23394449971. The next prime is 23394450019. The reversal of 23394449978 is 87994449332.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18794490649 + 4599959329 = 137093^2 + 67823^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23394449978.

It is not an unprimeable number, because it can be changed into a prime (23394449971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5848612493 + ... + 5848612496.

Almost surely, 2^23394449978 is an apocalyptic number.

23394449978 is a deficient number, since it is larger than the sum of its proper divisors (11697224992).

23394449978 is a wasteful number, since it uses less digits than its factorization.

23394449978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11697224991.

The product of its digits is 47029248, while the sum is 62.

The spelling of 23394449978 in words is "twenty-three billion, three hundred ninety-four million, four hundred forty-nine thousand, nine hundred seventy-eight".