53897781 has 8 divisors (see below), whose sum is σ = 82129984. Its totient is φ = 30798720.

The previous prime is 53897773. The next prime is 53897797. The reversal of 53897781 is 18779835.

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

It is not a de Polignac number, because 53897781 - 2³ = 53897773 is a prime.

It is a super-2 number, since 2×53897781² = 5809941593447922, which contains 22 as substring.

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 53897781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53897731) 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, 1283260 + ... + 1283301.

It is an arithmetic number, because the mean of its divisors is an integer number (10266248).

Almost surely, 2^53897781 is an apocalyptic number.

It is an amenable number.

53897781 is a deficient number, since it is larger than the sum of its proper divisors (28232203).

53897781 is a wasteful number, since it uses less digits than its factorization.

53897781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566571.

The product of its digits is 423360, while the sum is 48.

The square root of 53897781 is about 7341.5108118152. The cubic root of 53897781 is about 377.7376682682.

The spelling of 53897781 in words is "fifty-three million, eight hundred ninety-seven thousand, seven hundred eighty-one".