61421888 has 56 divisors (see below), whose sum is σ = 136123680. Its totient is φ = 27256320.

The previous prime is 61421863. The next prime is 61421897. The reversal of 61421888 is 88812416.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29258 + ... + 31286.

It is an arithmetic number, because the mean of its divisors is an integer number (2430780).

Almost surely, 2^61421888 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 61421888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68061840).

61421888 is an abundant number, since it is smaller than the sum of its proper divisors (74701792).

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

61421888 is a wasteful number, since it uses less digits than its factorization.

61421888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2095 (or 2085 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 61421888 is about 7837.2117490853. The cubic root of 61421888 is about 394.5551537479. Note that the first 3 decimals are identical.

The spelling of 61421888 in words is "sixty-one million, four hundred twenty-one thousand, eight hundred eighty-eight".