61636705 has 16 divisors (see below), whose sum is σ = 79828560. Its totient is φ = 45416448.

The previous prime is 61636699. The next prime is 61636723. The reversal of 61636705 is 50763616.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 25010001 + 36626704 = 5001^2 + 6052^2 .

It is a cyclic number.

It is not a de Polignac number, because 61636705 - 2¹³ = 61628513 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43041 + ... + 44449.

It is an arithmetic number, because the mean of its divisors is an integer number (4989285).

Almost surely, 2^61636705 is an apocalyptic number.

61636705 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61636705 is a deficient number, since it is larger than the sum of its proper divisors (18191855).

61636705 is a wasteful number, since it uses less digits than its factorization.

61636705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 61636705 is about 7850.9047249346. The cubic root of 61636705 is about 395.0145911397.

The spelling of 61636705 in words is "sixty-one million, six hundred thirty-six thousand, seven hundred five".