61728402 has 8 divisors (see below), whose sum is σ = 123456816. Its totient is φ = 20576132.

The previous prime is 61728391. The next prime is 61728413. The reversal of 61728402 is 20482716.

It is an interprime number because it is at equal distance from previous prime (61728391) and next prime (61728413).

It is a sphenic number, since it is the product of 3 distinct primes.

61728402 is an admirable number.

It is a super-2 number, since 2×61728402² = 7620791226947208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61728402.

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, 5144028 + ... + 5144039.

It is an arithmetic number, because the mean of its divisors is an integer number (15432102).

Almost surely, 2^61728402 is an apocalyptic number.

61728402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61728402 is a wasteful number, since it uses less digits than its factorization.

61728402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10288072.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 61728402 is about 7856.7424547328. The cubic root of 61728402 is about 395.2103819728.

The spelling of 61728402 in words is "sixty-one million, seven hundred twenty-eight thousand, four hundred two".