61643512 has 16 divisors (see below), whose sum is σ = 132093360. Its totient is φ = 26418624.

The previous prime is 61643507. The next prime is 61643539. The reversal of 61643512 is 21534616.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

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, 550333 + ... + 550444.

It is an arithmetic number, because the mean of its divisors is an integer number (8255835).

Almost surely, 2^61643512 is an apocalyptic number.

It is an amenable number.

61643512 is an abundant number, since it is smaller than the sum of its proper divisors (70449848).

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

61643512 is a wasteful number, since it uses less digits than its factorization.

61643512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100790 (or 1100786 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 61643512 is about 7851.3382298816. The cubic root of 61643512 is about 395.0291320713.

The spelling of 61643512 in words is "sixty-one million, six hundred forty-three thousand, five hundred twelve".