61220428 has 12 divisors (see below), whose sum is σ = 108603880. Its totient is φ = 30190752.

The previous prime is 61220407. The next prime is 61220473. The reversal of 61220428 is 82402216.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104538 + ... + 105121.

Almost surely, 2^61220428 is an apocalyptic number.

It is an amenable number.

61220428 is a deficient number, since it is larger than the sum of its proper divisors (47383452).

61220428 is a wasteful number, since it uses less digits than its factorization.

61220428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209736 (or 209734 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 61220428 is about 7824.3484073755. The cubic root of 61220428 is about 394.1233090814.

The spelling of 61220428 in words is "sixty-one million, two hundred twenty thousand, four hundred twenty-eight".