9478077781 has 4 divisors (see below), whose sum is σ = 9976924000. Its totient is φ = 8979231564.

The previous prime is 9478077773. The next prime is 9478077787. The reversal of 9478077781 is 1877708749.

9478077781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1877708749 = 7 ⋅268244107.

It is a cyclic number.

It is not a de Polignac number, because 9478077781 - 2³ = 9478077773 is a prime.

It is a super-2 number, since 2×9478077781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9478077787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249423081 + ... + 249423118.

It is an arithmetic number, because the mean of its divisors is an integer number (2494231000).

Almost surely, 2^9478077781 is an apocalyptic number.

It is an amenable number.

9478077781 is a deficient number, since it is larger than the sum of its proper divisors (498846219).

9478077781 is a wasteful number, since it uses less digits than its factorization.

9478077781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498846218.

The product of its (nonzero) digits is 5531904, while the sum is 58.

The square root of 9478077781 is about 97355.4198850788. The cubic root of 9478077781 is about 2116.2814382519.

The spelling of 9478077781 in words is "nine billion, four hundred seventy-eight million, seventy-seven thousand, seven hundred eighty-one".