61031880 has 448 divisors, whose sum is σ = 264418560. Its totient is φ = 12317184.

The previous prime is 61031851. The next prime is 61031881. The reversal of 61031880 is 8813016.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61031881) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 2653549 + ... + 2653571.

It is an arithmetic number, because the mean of its divisors is an integer number (590220).

Almost surely, 2^61031880 is an apocalyptic number.

61031880 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 61031880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132209280).

61031880 is an abundant number, since it is smaller than the sum of its proper divisors (203386680).

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

61031880 is a wasteful number, since it uses less digits than its factorization.

61031880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 61031880 is about 7812.2903171861. The cubic root of 61031880 is about 393.7182831595.

Adding to 61031880 its reverse (8813016), we get a palindrome (69844896).

The spelling of 61031880 in words is "sixty-one million, thirty-one thousand, eight hundred eighty".