61643824 has 20 divisors (see below), whose sum is σ = 130293000. Its totient is φ = 28019840.

The previous prime is 61643797. The next prime is 61643831. The reversal of 61643824 is 42834616.

It is a super-2 number, since 2×61643824² = 7599922074685952, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61643824.

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, 174949 + ... + 175300.

It is an arithmetic number, because the mean of its divisors is an integer number (6514650).

Almost surely, 2^61643824 is an apocalyptic number.

It is an amenable number.

61643824 is an abundant number, since it is smaller than the sum of its proper divisors (68649176).

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

61643824 is a wasteful number, since it uses less digits than its factorization.

61643824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350268 (or 350262 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 61643824 is about 7851.3580990807. The cubic root of 61643824 is about 395.0297985318.

The spelling of 61643824 in words is "sixty-one million, six hundred forty-three thousand, eight hundred twenty-four".