61640635 has 8 divisors (see below), whose sum is σ = 84535776. Its totient is φ = 42267840.

The previous prime is 61640633. The next prime is 61640647. The reversal of 61640635 is 53604616.

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

It is not a de Polignac number, because 61640635 - 2¹ = 61640633 is a prime.

It is a super-3 number, since 3×61640635³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61640597 and 61640606.

It is not an unprimeable number, because it can be changed into a prime (61640633) by changing a digit.

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, 880546 + ... + 880615.

It is an arithmetic number, because the mean of its divisors is an integer number (10566972).

Almost surely, 2^61640635 is an apocalyptic number.

61640635 is a deficient number, since it is larger than the sum of its proper divisors (22895141).

61640635 is a wasteful number, since it uses less digits than its factorization.

61640635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761173.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 61640635 is about 7851.1550105701. The cubic root of 61640635 is about 395.0229864314.

The spelling of 61640635 in words is "sixty-one million, six hundred forty thousand, six hundred thirty-five".