61728330 has 16 divisors (see below), whose sum is σ = 148148064. Its totient is φ = 16460880.

The previous prime is 61728319. The next prime is 61728367. The reversal of 61728330 is 3382716.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2057611 = 61728330 / (6 + 1 + 7 + 2 + 8 + 3 + 3 + 0).

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, 1028776 + ... + 1028835.

It is an arithmetic number, because the mean of its divisors is an integer number (9259254).

Almost surely, 2^61728330 is an apocalyptic number.

61728330 is an abundant number, since it is smaller than the sum of its proper divisors (86419734).

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

61728330 is a wasteful number, since it uses less digits than its factorization.

61728330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057621.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 61728330 is about 7856.7378726797. The cubic root of 61728330 is about 395.2102283149.

The spelling of 61728330 in words is "sixty-one million, seven hundred twenty-eight thousand, three hundred thirty".