61512728 has 32 divisors (see below), whose sum is σ = 121800000. Its totient is φ = 29043360.

The previous prime is 61512727. The next prime is 61512739. The reversal of 61512728 is 82721516.

It is a junction number, because it is equal to n+sod(n) for n = 61512694 and 61512703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75443 + ... + 76253.

It is an arithmetic number, because the mean of its divisors is an integer number (3806250).

Almost surely, 2^61512728 is an apocalyptic number.

It is an amenable number.

61512728 is a deficient number, since it is larger than the sum of its proper divisors (60287272).

61512728 is a wasteful number, since it uses less digits than its factorization.

61512728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335 (or 1331 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 61512728 is about 7843.0050363365. The cubic root of 61512728 is about 394.7495672629.

The spelling of 61512728 in words is "sixty-one million, five hundred twelve thousand, seven hundred twenty-eight".