61643000 has 32 divisors (see below), whose sum is σ = 144246960. Its totient is φ = 24656800.

The previous prime is 61642993. The next prime is 61643033. The reversal of 61643000 is 34616.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29822 + ... + 31821.

Almost surely, 2^61643000 is an apocalyptic number.

It is an amenable number.

61643000 is an abundant number, since it is smaller than the sum of its proper divisors (82603960).

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

61643000 is a wasteful number, since it uses less digits than its factorization.

61643000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61664 (or 61650 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 61643000 is about 7851.3056239074. The cubic root of 61643000 is about 395.0280383878.

Adding to 61643000 its reverse (34616), we get a palindrome (61677616).

The spelling of 61643000 in words is "sixty-one million, six hundred forty-three thousand".