49999987 has 6 divisors (see below), whose sum is σ = 51389268. Its totient is φ = 48647304.

The previous prime is 49999921. The next prime is 49999991. The reversal of 49999987 is 78999994.

It is a de Polignac number, because none of the positive numbers 2^k-49999987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49999387) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16893 + ... + 19630.

It is an arithmetic number, because the mean of its divisors is an integer number (8564878).

Almost surely, 2^49999987 is an apocalyptic number.

49999987 is a deficient number, since it is larger than the sum of its proper divisors (1389281).

49999987 is an equidigital number, since it uses as much as digits as its factorization.

49999987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36597 (or 36560 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 64.

The square root of 49999987 is about 7071.0668926266. The cubic root of 49999987 is about 368.4031179358.

It can be divided in two parts, 4999998 and 7, that added together give a palindrome (5000005).

The spelling of 49999987 in words is "forty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".