48777561 has 24 divisors (see below), whose sum is σ = 80847104. Its totient is φ = 27760320.

The previous prime is 48777559. The next prime is 48777571. The reversal of 48777561 is 16577784.

48777561 is a `hidden beast` number, since 4 + 87 + 7 + 7 + 561 = 666.

It is not a de Polignac number, because 48777561 - 2¹ = 48777559 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (48777571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15645 + ... + 18501.

Almost surely, 2^48777561 is an apocalyptic number.

It is an amenable number.

48777561 is a deficient number, since it is larger than the sum of its proper divisors (32069543).

48777561 is a wasteful number, since it uses less digits than its factorization.

48777561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141 (or 3138 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 48777561 is about 6984.0934272101. The cubic root of 48777561 is about 365.3760083399.

The spelling of 48777561 in words is "forty-eight million, seven hundred seventy-seven thousand, five hundred sixty-one".