61656020 has 12 divisors (see below), whose sum is σ = 129477684. Its totient is φ = 24662400.

The previous prime is 61656017. The next prime is 61656029. The reversal of 61656020 is 2065616.

It can be written as a sum of positive squares in 2 ways, for example, as 22543504 + 39112516 = 4748^2 + 6254^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61656029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541381 + ... + 1541420.

It is an arithmetic number, because the mean of its divisors is an integer number (10789807).

Almost surely, 2^61656020 is an apocalyptic number.

It is an amenable number.

61656020 is an abundant number, since it is smaller than the sum of its proper divisors (67821664).

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

61656020 is a wasteful number, since it uses less digits than its factorization.

61656020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082810 (or 3082808 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 61656020 is about 7852.1347415846. The cubic root of 61656020 is about 395.0558485365.

The spelling of 61656020 in words is "sixty-one million, six hundred fifty-six thousand, twenty".