61728069 has 16 divisors (see below), whose sum is σ = 89518464. Its totient is φ = 37608000.

The previous prime is 61728041. The next prime is 61728089. The reversal of 61728069 is 96082716.

It is not a de Polignac number, because 61728069 - 2⁹ = 61727557 is a prime.

It is a super-2 number, since 2×61728069² = 7620709004937522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61728019) 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, 3897 + ... + 11774.

It is an arithmetic number, because the mean of its divisors is an integer number (5594904).

Almost surely, 2^61728069 is an apocalyptic number.

It is an amenable number.

61728069 is a deficient number, since it is larger than the sum of its proper divisors (27790395).

61728069 is a wasteful number, since it uses less digits than its factorization.

61728069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15788.

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

The square root of 61728069 is about 7856.7212627151. The cubic root of 61728069 is about 395.2096713043.

It can be divided in two parts, 6172 and 8069, that added together give a palindrome (14241).

The spelling of 61728069 in words is "sixty-one million, seven hundred twenty-eight thousand, sixty-nine".