61638805 has 8 divisors (see below), whose sum is σ = 74685312. Its totient is φ = 48831888.

The previous prime is 61638779. The next prime is 61638809. The reversal of 61638805 is 50883616.

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

It is not a de Polignac number, because 61638805 - 2⁷ = 61638677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61638809) 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, 59329 + ... + 60358.

It is an arithmetic number, because the mean of its divisors is an integer number (9335664).

Almost surely, 2^61638805 is an apocalyptic number.

It is an amenable number.

61638805 is a deficient number, since it is larger than the sum of its proper divisors (13046507).

61638805 is a wasteful number, since it uses less digits than its factorization.

61638805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119795.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 61638805 is about 7851.0384663432. The cubic root of 61638805 is about 395.0190772178.

The spelling of 61638805 in words is "sixty-one million, six hundred thirty-eight thousand, eight hundred five".