39478477728 has 48 divisors (see below), whose sum is σ = 103913470080. Its totient is φ = 13123623936.

The previous prime is 39478477679. The next prime is 39478477729. The reversal of 39478477728 is 82777487493.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (39478477729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525033 + ... + 595496.

It is an arithmetic number, because the mean of its divisors is an integer number (2164863960).

Almost surely, 2^39478477728 is an apocalyptic number.

It is an amenable number.

39478477728 is an abundant number, since it is smaller than the sum of its proper divisors (64434992352).

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

39478477728 is a wasteful number, since it uses less digits than its factorization.

39478477728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120909 (or 1120901 counting only the distinct ones).

The product of its digits is 132765696, while the sum is 66.

The spelling of 39478477728 in words is "thirty-nine billion, four hundred seventy-eight million, four hundred seventy-seven thousand, seven hundred twenty-eight".