61639634 has 8 divisors (see below), whose sum is σ = 105667968. Its totient is φ = 26416980.

The previous prime is 61639621. The next prime is 61639639. The reversal of 61639634 is 43693616.

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

It is not an unprimeable number, because it can be changed into a prime (61639639) 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, 2201402 + ... + 2201429.

It is an arithmetic number, because the mean of its divisors is an integer number (13208496).

Almost surely, 2^61639634 is an apocalyptic number.

61639634 is a deficient number, since it is larger than the sum of its proper divisors (44028334).

61639634 is a wasteful number, since it uses less digits than its factorization.

61639634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4402840.

The product of its digits is 69984, while the sum is 38.

The square root of 61639634 is about 7851.0912617292. The cubic root of 61639634 is about 395.0208481225.

The spelling of 61639634 in words is "sixty-one million, six hundred thirty-nine thousand, six hundred thirty-four".