135807778 has 16 divisors (see below), whose sum is σ = 213497856. Its totient is φ = 64667680.

The previous prime is 135807767. The next prime is 135807779. The reversal of 135807778 is 877708531.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (135807779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4383 + ... + 17053.

It is an arithmetic number, because the mean of its divisors is an integer number (13343616).

Almost surely, 2^135807778 is an apocalyptic number.

135807778 is a deficient number, since it is larger than the sum of its proper divisors (77690078).

135807778 is a wasteful number, since it uses less digits than its factorization.

135807778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12929.

The product of its (nonzero) digits is 329280, while the sum is 46.

The square root of 135807778 is about 11653.6594252621. The cubic root of 135807778 is about 514.0139211055.

The spelling of 135807778 in words is "one hundred thirty-five million, eight hundred seven thousand, seven hundred seventy-eight".