61528730 has 16 divisors (see below), whose sum is σ = 112087584. Its totient is φ = 24314640.

The previous prime is 61528723. The next prime is 61528757. The reversal of 61528730 is 3782516.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36236 + ... + 37895.

It is an arithmetic number, because the mean of its divisors is an integer number (7005474).

Almost surely, 2^61528730 is an apocalyptic number.

61528730 is a deficient number, since it is larger than the sum of its proper divisors (50558854).

61528730 is a wasteful number, since it uses less digits than its factorization.

61528730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74221.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 61528730 is about 7844.0251146972. The cubic root of 61528730 is about 394.7837945148.

The spelling of 61528730 in words is "sixty-one million, five hundred twenty-eight thousand, seven hundred thirty".