61628843520 has 280 divisors, whose sum is σ = 221552534016. Its totient is φ = 16433860608.

The previous prime is 61628843477. The next prime is 61628843531. The reversal of 61628843520 is 2534882616.

61628843520 is a `hidden beast` number, since 6 + 1 + 6 + 2 + 88 + 43 + 520 = 666.

It is a super-2 number, since 2×61628843520² (a number of 22 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1849729 + ... + 1882751.

Almost surely, 2^61628843520 is an apocalyptic number.

61628843520 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 61628843520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110776267008).

61628843520 is an abundant number, since it is smaller than the sum of its proper divisors (159923690496).

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

61628843520 is an frugal number, since it uses more digits than its factorization.

61628843520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33064 (or 33033 counting only the distinct ones).

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

The spelling of 61628843520 in words is "sixty-one billion, six hundred twenty-eight million, eight hundred forty-three thousand, five hundred twenty".