61728390 has 48 divisors (see below), whose sum is σ = 163919808. Its totient is φ = 16109568.

The previous prime is 61728367. The next prime is 61728391. The reversal of 61728390 is 9382716.

61728390 is a `hidden beast` number, since 617 + 2 + 8 + 39 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61728391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3067 + ... + 11526.

It is an arithmetic number, because the mean of its divisors is an integer number (3414996).

Almost surely, 2^61728390 is an apocalyptic number.

61728390 is an abundant number, since it is smaller than the sum of its proper divisors (102191418).

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

61728390 is a wasteful number, since it uses less digits than its factorization.

61728390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14653 (or 14650 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 61728390 is about 7856.7416910574. The cubic root of 61728390 is about 395.2103563631.

The spelling of 61728390 in words is "sixty-one million, seven hundred twenty-eight thousand, three hundred ninety".