61821360 has 80 divisors (see below), whose sum is σ = 212947680. Its totient is φ = 16485120.

The previous prime is 61821349. The next prime is 61821379. The reversal of 61821360 is 6312816.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 12151 + ... + 16470.

It is an arithmetic number, because the mean of its divisors is an integer number (2661846).

Almost surely, 2^61821360 is an apocalyptic number.

61821360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61821360 is an abundant number, since it is smaller than the sum of its proper divisors (151126320).

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

61821360 is a wasteful number, since it uses less digits than its factorization.

61821360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28643 (or 28631 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 61821360 is about 7862.6560397871. The cubic root of 61821360 is about 395.4086674699.

The spelling of 61821360 in words is "sixty-one million, eight hundred twenty-one thousand, three hundred sixty".