61859436 has 48 divisors (see below), whose sum is σ = 150444000. Its totient is φ = 19758592.

The previous prime is 61859423. The next prime is 61859453. The reversal of 61859436 is 63495816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51256 + ... + 52448.

It is an arithmetic number, because the mean of its divisors is an integer number (3134250).

Almost surely, 2^61859436 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 61859436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75222000).

61859436 is an abundant number, since it is smaller than the sum of its proper divisors (88584564).

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

61859436 is a wasteful number, since it uses less digits than its factorization.

61859436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378 (or 1376 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 61859436 is about 7865.0769862729. The cubic root of 61859436 is about 395.4898286875.

The spelling of 61859436 in words is "sixty-one million, eight hundred fifty-nine thousand, four hundred thirty-six".