61281486 has 48 divisors (see below), whose sum is σ = 152880000. Its totient is φ = 17378064.

The previous prime is 61281469. The next prime is 61281487. The reversal of 61281486 is 68418216.

It is a self number, because there is not a number n which added to its sum of digits gives 61281486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61281487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15765 + ... + 19263.

It is an arithmetic number, because the mean of its divisors is an integer number (3185000).

Almost surely, 2^61281486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61281486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76440000).

61281486 is an abundant number, since it is smaller than the sum of its proper divisors (91598514).

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

61281486 is a wasteful number, since it uses less digits than its factorization.

61281486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653 (or 3650 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 61281486 is about 7828.2492295532. The cubic root of 61281486 is about 394.2542914241.

The spelling of 61281486 in words is "sixty-one million, two hundred eighty-one thousand, four hundred eighty-six".