49991667 has 32 divisors (see below), whose sum is σ = 75085056. Its totient is φ = 29328000.

The previous prime is 49991653. The next prime is 49991681. The reversal of 49991667 is 76619994.

It is an interprime number because it is at equal distance from previous prime (49991653) and next prime (49991681).

It is not a de Polignac number, because 49991667 - 2⁸ = 49991411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (49991267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176508 + ... + 176790.

It is an arithmetic number, because the mean of its divisors is an integer number (2346408).

Almost surely, 2^49991667 is an apocalyptic number.

49991667 is a deficient number, since it is larger than the sum of its proper divisors (25093389).

49991667 is a wasteful number, since it uses less digits than its factorization.

49991667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451.

The product of its digits is 734832, while the sum is 51.

The square root of 49991667 is about 7070.4785552323. The cubic root of 49991667 is about 368.3826827040.

It can be divided in two parts, 4999 and 1667, that added together give a palindrome (6666).

The spelling of 49991667 in words is "forty-nine million, nine hundred ninety-one thousand, six hundred sixty-seven".