61506912928 has 96 divisors (see below), whose sum is σ = 130431183120. Its totient is φ = 28492800000.

The previous prime is 61506912893. The next prime is 61506912937. The reversal of 61506912928 is 82921960516.

It can be written as a sum of positive squares in 8 ways, for example, as 1103036944 + 60403875984 = 33212^2 + 245772^2 .

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, 2307678 + ... + 2334178.

Almost surely, 2^61506912928 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 61506912928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65215591560).

61506912928 is an abundant number, since it is smaller than the sum of its proper divisors (68924270192).

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

61506912928 is a wasteful number, since it uses less digits than its factorization.

61506912928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26642 (or 26634 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 61506912928 in words is "sixty-one billion, five hundred six million, nine hundred twelve thousand, nine hundred twenty-eight".