61212728 has 8 divisors (see below), whose sum is σ = 114773880. Its totient is φ = 30606360.

The previous prime is 61212719. The next prime is 61212743. The reversal of 61212728 is 82721216.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 61212728.

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, 3825788 + ... + 3825803.

It is an arithmetic number, because the mean of its divisors is an integer number (14346735).

Almost surely, 2^61212728 is an apocalyptic number.

It is an amenable number.

61212728 is a deficient number, since it is larger than the sum of its proper divisors (53561152).

61212728 is a wasteful number, since it uses less digits than its factorization.

61212728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7651597 (or 7651593 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 61212728 is about 7823.8563381494. The cubic root of 61212728 is about 394.1067847674.

The spelling of 61212728 in words is "sixty-one million, two hundred twelve thousand, seven hundred twenty-eight".