53609778 has 12 divisors (see below), whose sum is σ = 116154558. Its totient is φ = 17869920.

The previous prime is 53609767. The next prime is 53609779. The reversal of 53609778 is 87790635.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 53538489 + 71289 = 7317^2 + 267^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53609779) 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, 1489143 + ... + 1489178.

Almost surely, 2^53609778 is an apocalyptic number.

53609778 is an abundant number, since it is smaller than the sum of its proper divisors (62544780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53609778 is a wasteful number, since it uses less digits than its factorization.

53609778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978329 (or 2978326 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 53609778 is about 7321.8698431480. The cubic root of 53609778 is about 377.0636520752.

The spelling of 53609778 in words is "fifty-three million, six hundred nine thousand, seven hundred seventy-eight".