39878788506 has 16 divisors (see below), whose sum is σ = 80502976224. Its totient is φ = 13168696304.

The previous prime is 39878788451. The next prime is 39878788511. The reversal of 39878788506 is 60588787893.

It is a Curzon 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, 31057605 + ... + 31058888.

It is an arithmetic number, because the mean of its divisors is an integer number (5031436014).

Almost surely, 2^39878788506 is an apocalyptic number.

39878788506 is an abundant number, since it is smaller than the sum of its proper divisors (40624187718).

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

39878788506 is a wasteful number, since it uses less digits than its factorization.

39878788506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62116605.

The product of its (nonzero) digits is 162570240, while the sum is 69.

The spelling of 39878788506 in words is "thirty-nine billion, eight hundred seventy-eight million, seven hundred eighty-eight thousand, five hundred six".