61843400 has 48 divisors (see below), whose sum is σ = 144345300. Its totient is φ = 24641280.

The previous prime is 61843367. The next prime is 61843403. The reversal of 61843400 is 434816.

It can be written as a sum of positive squares in 6 ways, for example, as 25867396 + 35976004 = 5086^2 + 5998^2 .

It is a super-2 number, since 2×61843400² = 7649212247120000, 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 61843400.

It is not an unprimeable number, because it can be changed into a prime (61843403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74186 + ... + 75014.

Almost surely, 2^61843400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61843400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72172650).

61843400 is an abundant number, since it is smaller than the sum of its proper divisors (82501900).

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

61843400 is a wasteful number, since it uses less digits than its factorization.

61843400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 61843400 is about 7864.0574769008. The cubic root of 61843400 is about 395.4556510777.

The spelling of 61843400 in words is "sixty-one million, eight hundred forty-three thousand, four hundred".