61142872 has 16 divisors (see below), whose sum is σ = 131020560. Its totient is φ = 26204064.

The previous prime is 61142869. The next prime is 61142929. The reversal of 61142872 is 27824116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545863 + ... + 545974.

It is an arithmetic number, because the mean of its divisors is an integer number (8188785).

Almost surely, 2^61142872 is an apocalyptic number.

It is an amenable number.

61142872 is an abundant number, since it is smaller than the sum of its proper divisors (69877688).

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

61142872 is a wasteful number, since it uses less digits than its factorization.

61142872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091850 (or 1091846 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 61142872 is about 7819.3907691073. The cubic root of 61142872 is about 393.9568094066.

Adding to 61142872 its reverse (27824116), we get a palindrome (88966988).

The spelling of 61142872 in words is "sixty-one million, one hundred forty-two thousand, eight hundred seventy-two".