61030973640 has 256 divisors, whose sum is σ = 226611302400. Its totient is φ = 12804516864.

The previous prime is 61030973621. The next prime is 61030973651. The reversal of 61030973640 is 4637903016.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1939069 + ... + 1970291.

It is an arithmetic number, because the mean of its divisors is an integer number (885200400).

Almost surely, 2^61030973640 is an apocalyptic number.

61030973640 is a gapful number since it is divisible by the number (60) 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 61030973640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113305651200).

61030973640 is an abundant number, since it is smaller than the sum of its proper divisors (165580328760).

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

61030973640 is a wasteful number, since it uses less digits than its factorization.

61030973640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31436 (or 31432 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 39.

The spelling of 61030973640 in words is "sixty-one billion, thirty million, nine hundred seventy-three thousand, six hundred forty".