61704720 has 480 divisors, whose sum is σ = 274803840. Its totient is φ = 12579840.

The previous prime is 61704719. The next prime is 61704739. The reversal of 61704720 is 2740716.

61704720 is a `hidden beast` number, since 617 + 0 + 47 + 2 + 0 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 1164214 + ... + 1164266.

It is an arithmetic number, because the mean of its divisors is an integer number (572508).

Almost surely, 2^61704720 is an apocalyptic number.

61704720 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 61704720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137401920).

61704720 is an abundant number, since it is smaller than the sum of its proper divisors (213099120).

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

61704720 is a wasteful number, since it uses less digits than its factorization.

61704720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 61704720 is about 7855.2351969881. The cubic root of 61704720 is about 395.1598349036.

The spelling of 61704720 in words is "sixty-one million, seven hundred four thousand, seven hundred twenty".