61716820 has 48 divisors (see below), whose sum is σ = 147547008. Its totient is φ = 21464960.

The previous prime is 61716799. The next prime is 61716827. The reversal of 61716820 is 2861716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61716827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1039 + ... + 11158.

It is an arithmetic number, because the mean of its divisors is an integer number (3073896).

Almost surely, 2^61716820 is an apocalyptic number.

It is an amenable number.

61716820 is an abundant number, since it is smaller than the sum of its proper divisors (85830188).

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

61716820 is a wasteful number, since it uses less digits than its factorization.

61716820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12240 (or 12238 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 61716820 is about 7856.0053462304. The cubic root of 61716820 is about 395.1856628656.

The spelling of 61716820 in words is "sixty-one million, seven hundred sixteen thousand, eight hundred twenty".