61728388 has 12 divisors (see below), whose sum is σ = 109392640. Its totient is φ = 30473352.

The previous prime is 61728367. The next prime is 61728391. The reversal of 61728388 is 88382716.

It is a happy number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97356 + ... + 97987.

Almost surely, 2^61728388 is an apocalyptic number.

It is an amenable number.

61728388 is a deficient number, since it is larger than the sum of its proper divisors (47664252).

61728388 is a wasteful number, since it uses less digits than its factorization.

61728388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195426 (or 195424 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 61728388 is about 7856.7415637782. The cubic root of 61728388 is about 395.2103520949.

The spelling of 61728388 in words is "sixty-one million, seven hundred twenty-eight thousand, three hundred eighty-eight".