61640715 has 32 divisors (see below), whose sum is σ = 101604096. Its totient is φ = 31893120.

The previous prime is 61640707. The next prime is 61640717. The reversal of 61640715 is 51704616.

It is not a de Polignac number, because 61640715 - 2³ = 61640707 is a prime.

It is a super-2 number, since 2×61640715² = 7599155491422450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61640717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146205 + ... + 146625.

It is an arithmetic number, because the mean of its divisors is an integer number (3175128).

Almost surely, 2^61640715 is an apocalyptic number.

61640715 is a deficient number, since it is larger than the sum of its proper divisors (39963381).

61640715 is a wasteful number, since it uses less digits than its factorization.

61640715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 61640715 is about 7851.1601053602. The cubic root of 61640715 is about 395.0231573242.

The spelling of 61640715 in words is "sixty-one million, six hundred forty thousand, seven hundred fifteen".