61304432140 has 144 divisors (see below), whose sum is σ = 160996308480. Its totient is φ = 19488470400.

The previous prime is 61304432099. The next prime is 61304432141. The reversal of 61304432140 is 4123440316.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 61304432099 and 61304432108.

It is not an unprimeable number, because it can be changed into a prime (61304432141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 840115 + ... + 910165.

It is an arithmetic number, because the mean of its divisors is an integer number (1118029920).

Almost surely, 2^61304432140 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 61304432140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80498154240).

61304432140 is an abundant number, since it is smaller than the sum of its proper divisors (99691876340).

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

61304432140 is a wasteful number, since it uses less digits than its factorization.

61304432140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70140 (or 70131 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 61304432140 its reverse (4123440316), we get a palindrome (65427872456).

The spelling of 61304432140 in words is "sixty-one billion, three hundred four million, four hundred thirty-two thousand, one hundred forty".