61564615 has 8 divisors (see below), whose sum is σ = 84431520. Its totient is φ = 42215712.

The previous prime is 61564609. The next prime is 61564619. The reversal of 61564615 is 51646516.

It is a happy number.

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

It is not a de Polignac number, because 61564615 - 2⁷ = 61564487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61564619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879460 + ... + 879529.

It is an arithmetic number, because the mean of its divisors is an integer number (10553940).

Almost surely, 2^61564615 is an apocalyptic number.

61564615 is a deficient number, since it is larger than the sum of its proper divisors (22866905).

61564615 is a wasteful number, since it uses less digits than its factorization.

61564615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759001.

The product of its digits is 21600, while the sum is 34.

The square root of 61564615 is about 7846.3121910870. The cubic root of 61564615 is about 394.8605286584.

The spelling of 61564615 in words is "sixty-one million, five hundred sixty-four thousand, six hundred fifteen".