53778438 has 32 divisors (see below), whose sum is σ = 136581120. Its totient is φ = 15365160.

The previous prime is 53778437. The next prime is 53778467. The reversal of 53778438 is 83487735.

53778438 is a `hidden beast` number, since 537 + 7 + 84 + 38 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 53778393 and 53778402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53778433) 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, 70758 + ... + 71513.

It is an arithmetic number, because the mean of its divisors is an integer number (4268160).

Almost surely, 2^53778438 is an apocalyptic number.

53778438 is an abundant number, since it is smaller than the sum of its proper divisors (82802682).

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

53778438 is a wasteful number, since it uses less digits than its factorization.

53778438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142289 (or 142283 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 53778438 is about 7333.3783483467. The cubic root of 53778438 is about 377.4586607364.

The spelling of 53778438 in words is "fifty-three million, seven hundred seventy-eight thousand, four hundred thirty-eight".