61311104 has 64 divisors (see below), whose sum is σ = 128520000. Its totient is φ = 29094912.

The previous prime is 61311091. The next prime is 61311137. The reversal of 61311104 is 40111316.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307997 + ... + 308195.

It is an arithmetic number, because the mean of its divisors is an integer number (2008125).

Almost surely, 2^61311104 is an apocalyptic number.

61311104 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61311104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64260000).

61311104 is an abundant number, since it is smaller than the sum of its proper divisors (67208896).

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

61311104 is a wasteful number, since it uses less digits than its factorization.

61311104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 61311104 is about 7830.1407394759. The cubic root of 61311104 is about 394.3177969713.

The spelling of 61311104 in words is "sixty-one million, three hundred eleven thousand, one hundred four".