61529864 has 32 divisors (see below), whose sum is σ = 126584640. Its totient is φ = 27806400.

The previous prime is 61529857. The next prime is 61529869. The reversal of 61529864 is 46892516.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61529869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13997 + ... + 17859.

It is an arithmetic number, because the mean of its divisors is an integer number (3955770).

Almost surely, 2^61529864 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 61529864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63292320).

61529864 is an abundant number, since it is smaller than the sum of its proper divisors (65054776).

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

61529864 is a wasteful number, since it uses less digits than its factorization.

61529864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061 (or 4057 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The square root of 61529864 is about 7844.0973986814. The cubic root of 61529864 is about 394.7862198429.

It can be divided in two parts, 61 and 529864, that added together give a palindrome (529925).

The spelling of 61529864 in words is "sixty-one million, five hundred twenty-nine thousand, eight hundred sixty-four".