61438280 has 32 divisors (see below), whose sum is σ = 142698240. Its totient is φ = 23782080.

The previous prime is 61438277. The next prime is 61438301. The reversal of 61438280 is 8283416.

61438280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23534 + ... + 26013.

It is an arithmetic number, because the mean of its divisors is an integer number (4459320).

Almost surely, 2^61438280 is an apocalyptic number.

It is an amenable number.

61438280 is an abundant number, since it is smaller than the sum of its proper divisors (81259960).

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

61438280 is a wasteful number, since it uses less digits than its factorization.

61438280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49589 (or 49585 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 61438280 is about 7838.2574594102. The cubic root of 61438280 is about 394.5902496669.

The spelling of 61438280 in words is "sixty-one million, four hundred thirty-eight thousand, two hundred eighty".