61869720 has 96 divisors (see below), whose sum is σ = 204064560. Its totient is φ = 14995200.

The previous prime is 61869679. The next prime is 61869721. The reversal of 61869720 is 2796816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61869721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12390 + ... + 16650.

Almost surely, 2^61869720 is an apocalyptic number.

61869720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61869720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102032280).

61869720 is an abundant number, since it is smaller than the sum of its proper divisors (142194840).

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

61869720 is a wasteful number, since it uses less digits than its factorization.

61869720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4297 (or 4282 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 61869720 is about 7865.7307352845. The cubic root of 61869720 is about 395.5117439214.

The spelling of 61869720 in words is "sixty-one million, eight hundred sixty-nine thousand, seven hundred twenty".