253778436 has 18 divisors (see below), whose sum is σ = 641495582. Its totient is φ = 84592800.

The previous prime is 253778429. The next prime is 253778461. The reversal of 253778436 is 634877352.

253778436 is a `hidden beast` number, since 2 + 537 + 7 + 84 + 36 = 666.

253778436 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 247873536 + 5904900 = 15744^2 + 2430^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 253778391 and 253778400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3524665 + ... + 3524736.

Almost surely, 2^253778436 is an apocalyptic number.

It is an amenable number.

253778436 is an abundant number, since it is smaller than the sum of its proper divisors (387717146).

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

253778436 is a wasteful number, since it uses less digits than its factorization.

253778436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7049411 (or 7049406 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 253778436 is about 15930.4248530916. The cubic root of 253778436 is about 633.1183564616.

The spelling of 253778436 in words is "two hundred fifty-three million, seven hundred seventy-eight thousand, four hundred thirty-six".