47755777 has 4 divisors (see below), whose sum is σ = 47919060. Its totient is φ = 47592496.

The previous prime is 47755769. The next prime is 47755781. The reversal of 47755777 is 77755774.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77755774 = 2 ⋅38877887.

It can be written as a sum of positive squares in 2 ways, for example, as 23902321 + 23853456 = 4889^2 + 4884^2 .

It is a cyclic number.

It is not a de Polignac number, because 47755777 - 2³ = 47755769 is a prime.

It is a super-2 number, since 2×47755777² = 4561228473747458, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47755777.

It is not an unprimeable number, because it can be changed into a prime (47755787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81202 + ... + 81787.

It is an arithmetic number, because the mean of its divisors is an integer number (11979765).

Almost surely, 2^47755777 is an apocalyptic number.

It is an amenable number.

47755777 is a deficient number, since it is larger than the sum of its proper divisors (163283).

47755777 is a wasteful number, since it uses less digits than its factorization.

47755777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163282.

The product of its digits is 1680700, while the sum is 49.

The square root of 47755777 is about 6910.5554769497. Note that the first 3 decimals coincide. The cubic root of 47755777 is about 362.8067054698.

The spelling of 47755777 in words is "forty-seven million, seven hundred fifty-five thousand, seven hundred seventy-seven".