61428440 has 32 divisors (see below), whose sum is σ = 140562000. Its totient is φ = 24153984.

The previous prime is 61428439. The next prime is 61428443. The reversal of 61428440 is 4482416.

61428440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61428443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10655 + ... + 15374.

Almost surely, 2^61428440 is an apocalyptic number.

It is an amenable number.

61428440 is an abundant number, since it is smaller than the sum of its proper divisors (79133560).

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

61428440 is a wasteful number, since it uses less digits than its factorization.

61428440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26099 (or 26095 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 61428440 is about 7837.6297437427. The cubic root of 61428440 is about 394.5691825875.

The spelling of 61428440 in words is "sixty-one million, four hundred twenty-eight thousand, four hundred forty".