39878139078 has 32 divisors (see below), whose sum is σ = 88642667520. Its totient is φ = 13289025960.

The previous prime is 39878139071. The next prime is 39878139121. The reversal of 39878139078 is 87093187893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39878139071) 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, 97651 + ... + 298817.

It is an arithmetic number, because the mean of its divisors is an integer number (2770083360).

Almost surely, 2^39878139078 is an apocalyptic number.

39878139078 is an abundant number, since it is smaller than the sum of its proper divisors (48764528442).

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

39878139078 is a wasteful number, since it uses less digits than its factorization.

39878139078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204849 (or 204843 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 39878139078 in words is "thirty-nine billion, eight hundred seventy-eight million, one hundred thirty-nine thousand, seventy-eight".