9778727385 has 72 divisors (see below), whose sum is σ = 20011694976. Its totient is φ = 4403488320.

The previous prime is 9778727377. The next prime is 9778727393. The reversal of 9778727385 is 5837278779.

It is an interprime number because it is at equal distance from previous prime (9778727377) and next prime (9778727393).

It is not a de Polignac number, because 9778727385 - 2³ = 9778727377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 114640 + ... + 180830.

It is an arithmetic number, because the mean of its divisors is an integer number (277940208).

Almost surely, 2^9778727385 is an apocalyptic number.

It is an amenable number.

9778727385 is an abundant number, since it is smaller than the sum of its proper divisors (10232967591).

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

9778727385 is a wasteful number, since it uses less digits than its factorization.

9778727385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66283 (or 66273 counting only the distinct ones).

The product of its digits is 41489280, while the sum is 63.

The square root of 9778727385 is about 98887.4480659704. The cubic root of 9778727385 is about 2138.4254427055.

The spelling of 9778727385 in words is "nine billion, seven hundred seventy-eight million, seven hundred twenty-seven thousand, three hundred eighty-five".