49639681 has 32 divisors (see below), whose sum is σ = 65576448. Its totient is φ = 36495360.

The previous prime is 49639669. The next prime is 49639687. The reversal of 49639681 is 18693694.

It is a cyclic number.

It is not a de Polignac number, because 49639681 - 2⁹ = 49639169 is a prime.

It is a super-2 number, since 2×49639681² = 4928195859563522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (49639687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77121 + ... + 77761.

It is an arithmetic number, because the mean of its divisors is an integer number (2049264).

Almost surely, 2^49639681 is an apocalyptic number.

It is an amenable number.

49639681 is a deficient number, since it is larger than the sum of its proper divisors (15936767).

49639681 is a wasteful number, since it uses less digits than its factorization.

49639681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721.

The product of its digits is 279936, while the sum is 46.

The square root of 49639681 is about 7045.5433431354. The cubic root of 49639681 is about 367.5160645175.

The spelling of 49639681 in words is "forty-nine million, six hundred thirty-nine thousand, six hundred eighty-one".