61640316 has 18 divisors (see below), whose sum is σ = 155813112. Its totient is φ = 20546760.

The previous prime is 61640297. The next prime is 61640321. The reversal of 61640316 is 61304616.

61640316 is a `hidden beast` number, since 6 + 1 + 640 + 3 + 16 = 666.

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

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61640316.

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, 856080 + ... + 856151.

It is an arithmetic number, because the mean of its divisors is an integer number (8656284).

Almost surely, 2^61640316 is an apocalyptic number.

It is an amenable number.

61640316 is an abundant number, since it is smaller than the sum of its proper divisors (94172796).

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

61640316 is a wasteful number, since it uses less digits than its factorization.

61640316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712241 (or 1712236 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 61640316 is about 7851.1346950616. The cubic root of 61640316 is about 395.0223049948.

The spelling of 61640316 in words is "sixty-one million, six hundred forty thousand, three hundred sixteen".