49578991 has 8 divisors (see below), whose sum is σ = 61812864. Its totient is φ = 38632920.

The previous prime is 49578989. The next prime is 49579003. The reversal of 49578991 is 19987594.

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

It is a cyclic number.

It is not a de Polignac number, because 49578991 - 2¹ = 49578989 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 (49578911) 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, 321865 + ... + 322018.

It is an arithmetic number, because the mean of its divisors is an integer number (7726608).

Almost surely, 2^49578991 is an apocalyptic number.

49578991 is a deficient number, since it is larger than the sum of its proper divisors (12233873).

49578991 is a wasteful number, since it uses less digits than its factorization.

49578991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643901.

The product of its digits is 816480, while the sum is 52.

The square root of 49578991 is about 7041.2350479160. The cubic root of 49578991 is about 367.3662270917.

The spelling of 49578991 in words is "forty-nine million, five hundred seventy-eight thousand, nine hundred ninety-one".