61328615 has 8 divisors (see below), whose sum is σ = 73720800. Its totient is φ = 48978592.

The previous prime is 61328609. The next prime is 61328623. The reversal of 61328615 is 51682316.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61328615 - 2¹⁶ = 61263079 is a prime.

It is a super-2 number, since 2×61328615² = 7522398035636450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7244 + ... + 13233.

It is an arithmetic number, because the mean of its divisors is an integer number (9215100).

Almost surely, 2^61328615 is an apocalyptic number.

61328615 is a deficient number, since it is larger than the sum of its proper divisors (12392185).

61328615 is a wasteful number, since it uses less digits than its factorization.

61328615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21081.

The product of its digits is 8640, while the sum is 32.

The square root of 61328615 is about 7831.2588387819. The cubic root of 61328615 is about 394.3553336285.

The spelling of 61328615 in words is "sixty-one million, three hundred twenty-eight thousand, six hundred fifteen".