39778679745 has 256 divisors, whose sum is σ = 86593536000. Its totient is φ = 16935367680.

The previous prime is 39778679723. The next prime is 39778679747. The reversal of 39778679745 is 54797687793.

It is not a de Polignac number, because 39778679745 - 2⁵ = 39778679713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39778679747) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 229934479 + ... + 229934651.

It is an arithmetic number, because the mean of its divisors is an integer number (338256000).

Almost surely, 2^39778679745 is an apocalyptic number.

39778679745 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

39778679745 is an abundant number, since it is smaller than the sum of its proper divisors (46814856255).

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

39778679745 is a wasteful number, since it uses less digits than its factorization.

39778679745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 431 counting only the distinct ones).

The product of its digits is 560105280, while the sum is 72.

The spelling of 39778679745 in words is "thirty-nine billion, seven hundred seventy-eight million, six hundred seventy-nine thousand, seven hundred forty-five".