9778120084 has 6 divisors (see below), whose sum is σ = 17111710154. Its totient is φ = 4889060040.

The previous prime is 9778120073. The next prime is 9778120109. The reversal of 9778120084 is 4800218779.

It can be written as a sum of positive squares in only one way, i.e., 7186291984 + 2591828100 = 84772^2 + 50910^2 .

It is a super-2 number, since 2×9778120084² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1222265007 + ... + 1222265014.

Almost surely, 2^9778120084 is an apocalyptic number.

It is an amenable number.

9778120084 is a deficient number, since it is larger than the sum of its proper divisors (7333590070).

9778120084 is a wasteful number, since it uses less digits than its factorization.

9778120084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444530025 (or 2444530023 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 9778120084 is about 98884.3773505198. The cubic root of 9778120084 is about 2138.3811733187.

The spelling of 9778120084 in words is "nine billion, seven hundred seventy-eight million, one hundred twenty thousand, eighty-four".