61321064 has 64 divisors (see below), whose sum is σ = 135475200. Its totient is φ = 25481664.

The previous prime is 61321049. The next prime is 61321079. The reversal of 61321064 is 46012316.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61321049) and next prime (61321079).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367109 + ... + 367275.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^61321064 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 61321064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67737600).

61321064 is an abundant number, since it is smaller than the sum of its proper divisors (74154136).

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

61321064 is a wasteful number, since it uses less digits than its factorization.

61321064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 61321064 is about 7830.7767175421. The cubic root of 61321064 is about 394.3391481478.

The spelling of 61321064 in words is "sixty-one million, three hundred twenty-one thousand, sixty-four".