61433728 has 16 divisors (see below), whose sum is σ = 122387760. Its totient is φ = 30716800.

The previous prime is 61433719. The next prime is 61433741. The reversal of 61433728 is 82733416.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 61433693 and 61433702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239848 + ... + 240103.

It is an arithmetic number, because the mean of its divisors is an integer number (7649235).

Almost surely, 2^61433728 is an apocalyptic number.

It is an amenable number.

61433728 is a deficient number, since it is larger than the sum of its proper divisors (60954032).

61433728 is an equidigital number, since it uses as much as digits as its factorization.

61433728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479965 (or 479953 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 61433728 is about 7837.9670833705. The cubic root of 61433728 is about 394.5805042813.

The spelling of 61433728 in words is "sixty-one million, four hundred thirty-three thousand, seven hundred twenty-eight".