133778769 has 16 divisors (see below), whose sum is σ = 186326400. Its totient is φ = 85268736.

The previous prime is 133778767. The next prime is 133778773. The reversal of 133778769 is 967877331.

It is not a de Polignac number, because 133778769 - 2¹ = 133778767 is a prime.

It is a super-2 number, since 2×133778769² = 35793518070310722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133778767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1497 + ... + 16425.

It is an arithmetic number, because the mean of its divisors is an integer number (11645400).

Almost surely, 2^133778769 is an apocalyptic number.

It is an amenable number.

133778769 is a deficient number, since it is larger than the sum of its proper divisors (52547631).

133778769 is a wasteful number, since it uses less digits than its factorization.

133778769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15064.

The product of its digits is 1333584, while the sum is 51.

The square root of 133778769 is about 11566.2772316766. The cubic root of 133778769 is about 511.4412251666.

The spelling of 133778769 in words is "one hundred thirty-three million, seven hundred seventy-eight thousand, seven hundred sixty-nine".