61640292928 has 112 divisors (see below), whose sum is σ = 136412532864. Its totient is φ = 27485511680.

The previous prime is 61640292919. The next prime is 61640292953. The reversal of 61640292928 is 82929204616.

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, 2666058 + ... + 2689078.

Almost surely, 2^61640292928 is an apocalyptic number.

61640292928 is a gapful number since it is divisible by the number (68) 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 61640292928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68206266432).

61640292928 is an abundant number, since it is smaller than the sum of its proper divisors (74772239936).

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

61640292928 is a wasteful number, since it uses less digits than its factorization.

61640292928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23180 (or 23170 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 61640292928 in words is "sixty-one billion, six hundred forty million, two hundred ninety-two thousand, nine hundred twenty-eight".