53777391 has 32 divisors (see below), whose sum is σ = 79453440. Its totient is φ = 32223744.

The previous prime is 53777357. The next prime is 53777407. The reversal of 53777391 is 19377735.

It is not a de Polignac number, because 53777391 - 2⁷ = 53777263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53777791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90391 + ... + 90983.

It is an arithmetic number, because the mean of its divisors is an integer number (2482920).

Almost surely, 2^53777391 is an apocalyptic number.

53777391 is a deficient number, since it is larger than the sum of its proper divisors (25676049).

53777391 is a wasteful number, since it uses less digits than its factorization.

53777391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695.

The product of its digits is 138915, while the sum is 42.

The square root of 53777391 is about 7333.3069620738. The cubic root of 53777391 is about 377.4562111687.

The spelling of 53777391 in words is "fifty-three million, seven hundred seventy-seven thousand, three hundred ninety-one".