61709436 has 18 divisors (see below), whose sum is σ = 155987832. Its totient is φ = 20569800.

The previous prime is 61709423. The next prime is 61709443. The reversal of 61709436 is 63490716.

61709436 is a `hidden beast` number, since 617 + 0 + 9 + 4 + 36 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1714151 = 61709436 / (6 + 1 + 7 + 0 + 9 + 4 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 61709436.

It is a congruent number.

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, 857040 + ... + 857111.

Almost surely, 2^61709436 is an apocalyptic number.

It is an amenable number.

61709436 is an abundant number, since it is smaller than the sum of its proper divisors (94278396).

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

61709436 is a wasteful number, since it uses less digits than its factorization.

61709436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714161 (or 1714156 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 61709436 is about 7855.5353732257. The cubic root of 61709436 is about 395.1699018066.

The spelling of 61709436 in words is "sixty-one million, seven hundred nine thousand, four hundred thirty-six".