9778438072 has 32 divisors (see below), whose sum is σ = 19815248880. Its totient is φ = 4497050880.

The previous prime is 9778438057. The next prime is 9778438073. The reversal of 9778438072 is 2708348779.

It is a super-2 number, since 2×9778438072² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9778438073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138078 + ... + 196525.

Almost surely, 2^9778438072 is an apocalyptic number.

It is an amenable number.

9778438072 is an abundant number, since it is smaller than the sum of its proper divisors (10036810808).

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

9778438072 is a wasteful number, since it uses less digits than its factorization.

9778438072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334903 (or 334899 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 55.

The square root of 9778438072 is about 98885.9852152973. The cubic root of 9778438072 is about 2138.4043533771.

The spelling of 9778438072 in words is "nine billion, seven hundred seventy-eight million, four hundred thirty-eight thousand, seventy-two".