61805136 has 20 divisors (see below), whose sum is σ = 159663392. Its totient is φ = 20601696.

The previous prime is 61805129. The next prime is 61805167. The reversal of 61805136 is 63150816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643756 + ... + 643851.

Almost surely, 2^61805136 is an apocalyptic number.

It is an amenable number.

61805136 is an abundant number, since it is smaller than the sum of its proper divisors (97858256).

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

61805136 is a wasteful number, since it uses less digits than its factorization.

61805136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287618 (or 1287612 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 61805136 is about 7861.6242596553. The cubic root of 61805136 is about 395.3740749413.

Subtracting from 61805136 its product of nonzero digits (4320), we obtain a palindrome (61800816).

The spelling of 61805136 in words is "sixty-one million, eight hundred five thousand, one hundred thirty-six".