61728379 has 4 divisors (see below), whose sum is σ = 62199720. Its totient is φ = 61257040.

The previous prime is 61728367. The next prime is 61728391. The reversal of 61728379 is 97382716.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (61728367) and next prime (61728391).

It is a cyclic number.

It is not a de Polignac number, because 61728379 - 2¹³ = 61720187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61728319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235474 + ... + 235735.

It is an arithmetic number, because the mean of its divisors is an integer number (15549930).

Almost surely, 2^61728379 is an apocalyptic number.

61728379 is a deficient number, since it is larger than the sum of its proper divisors (471341).

61728379 is a wasteful number, since it uses less digits than its factorization.

61728379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471340.

The product of its digits is 127008, while the sum is 43.

The square root of 61728379 is about 7856.7409910217. The cubic root of 61728379 is about 395.2103328876.

The spelling of 61728379 in words is "sixty-one million, seven hundred twenty-eight thousand, three hundred seventy-nine".