61428066 has 48 divisors (see below), whose sum is σ = 146802816. Its totient is φ = 17073504.

The previous prime is 61428053. The next prime is 61428077. The reversal of 61428066 is 66082416.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8055 + ... + 13701.

It is an arithmetic number, because the mean of its divisors is an integer number (3058392).

Almost surely, 2^61428066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61428066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73401408).

61428066 is an abundant number, since it is smaller than the sum of its proper divisors (85374750).

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

61428066 is a wasteful number, since it uses less digits than its factorization.

61428066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703 (or 5696 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 61428066 is about 7837.6058844522. The cubic root of 61428066 is about 394.5683818228.

It can be divided in two parts, 614 and 28066, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 61428066 in words is "sixty-one million, four hundred twenty-eight thousand, sixty-six".