49521618 has 80 divisors (see below), whose sum is σ = 117089280. Its totient is φ = 15621984.

The previous prime is 49521617. The next prime is 49521623. The reversal of 49521618 is 81612594.

49521618 is a `hidden beast` number, since 495 + 2 + 161 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (49521611) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 389871 + ... + 389997.

It is an arithmetic number, because the mean of its divisors is an integer number (1463616).

Almost surely, 2^49521618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 49521618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58544640).

49521618 is an abundant number, since it is smaller than the sum of its proper divisors (67567662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

49521618 is a wasteful number, since it uses less digits than its factorization.

49521618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 244 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 49521618 is about 7037.1597963951. The cubic root of 49521618 is about 367.2244665230.

The spelling of 49521618 in words is "forty-nine million, five hundred twenty-one thousand, six hundred eighteen".