11428378461 has 6 divisors (see below), whose sum is σ = 16507657790. Its totient is φ = 7618918968.

The previous prime is 11428378397. The next prime is 11428378463. The reversal of 11428378461 is 16487382411.

11428378461 is a `hidden beast` number, since 1 + 1 + 42 + 83 + 78 + 461 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6706627236 + 4721751225 = 81894^2 + 68715^2 .

It is not a de Polignac number, because 11428378461 - 2⁶ = 11428378397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11428378463) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 634909906 + ... + 634909923.

Almost surely, 2^11428378461 is an apocalyptic number.

It is an amenable number.

11428378461 is a deficient number, since it is larger than the sum of its proper divisors (5079279329).

11428378461 is a wasteful number, since it uses less digits than its factorization.

11428378461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269819835 (or 1269819832 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The spelling of 11428378461 in words is "eleven billion, four hundred twenty-eight million, three hundred seventy-eight thousand, four hundred sixty-one".