61428568320 has 576 divisors, whose sum is σ = 257194721280. Its totient is φ = 13586227200.

The previous prime is 61428568303. The next prime is 61428568321. The reversal of 61428568320 is 2386582416.

61428568320 is a `hidden beast` number, since 61 + 4 + 2 + 8 + 568 + 3 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (61428568321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7495425 + ... + 7503615.

Almost surely, 2^61428568320 is an apocalyptic number.

61428568320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61428568320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128597360640).

61428568320 is an abundant number, since it is smaller than the sum of its proper divisors (195766152960).

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

61428568320 is a wasteful number, since it uses less digits than its factorization.

61428568320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8259 (or 8239 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 61428568320 in words is "sixty-one billion, four hundred twenty-eight million, five hundred sixty-eight thousand, three hundred twenty".