9619778421 has 72 divisors (see below), whose sum is σ = 15557680320. Its totient is φ = 5722738560.

The previous prime is 9619778419. The next prime is 9619778453. The reversal of 9619778421 is 1248779169.

9619778421 is a `hidden beast` number, since 9 + 61 + 97 + 78 + 421 = 666.

9619778421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9619778421 - 2¹ = 9619778419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9619778401) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15590905 + ... + 15591521.

Almost surely, 2^9619778421 is an apocalyptic number.

It is an amenable number.

9619778421 is a deficient number, since it is larger than the sum of its proper divisors (5937901899).

9619778421 is a wasteful number, since it uses less digits than its factorization.

9619778421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 873 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 9619778421 is about 98080.4691108276. The cubic root of 9619778421 is about 2126.7757002494.

The spelling of 9619778421 in words is "nine billion, six hundred nineteen million, seven hundred seventy-eight thousand, four hundred twenty-one".