61728408 has 48 divisors (see below), whose sum is σ = 191065680. Its totient is φ = 17636544.

The previous prime is 61728391. The next prime is 61728413. The reversal of 61728408 is 80482716.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60735 + ... + 61742.

It is an arithmetic number, because the mean of its divisors is an integer number (3980535).

Almost surely, 2^61728408 is an apocalyptic number.

It is an amenable number.

61728408 is an abundant number, since it is smaller than the sum of its proper divisors (129337272).

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

61728408 is a wasteful number, since it uses less digits than its factorization.

61728408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122496 (or 122489 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 61728408 is about 7856.7428365704. The cubic root of 61728408 is about 395.2103947776.

The spelling of 61728408 in words is "sixty-one million, seven hundred twenty-eight thousand, four hundred eight".