54708781 has 4 divisors (see below), whose sum is σ = 54805500. Its totient is φ = 54612064.

The previous prime is 54708767. The next prime is 54708793. The reversal of 54708781 is 18780745.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18780745 = 5 ⋅3756149.

It can be written as a sum of positive squares in 2 ways, for example, as 37319881 + 17388900 = 6109^2 + 4170^2 .

It is a cyclic number.

It is not a de Polignac number, because 54708781 - 2⁵ = 54708749 is a prime.

It is a super-2 number, since 2×54708781² = 5986101437011922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54708721) 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, 47506 + ... + 48643.

It is an arithmetic number, because the mean of its divisors is an integer number (13701375).

Almost surely, 2^54708781 is an apocalyptic number.

It is an amenable number.

54708781 is a deficient number, since it is larger than the sum of its proper divisors (96719).

54708781 is an equidigital number, since it uses as much as digits as its factorization.

54708781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96718.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 54708781 is about 7396.5384471386. The cubic root of 54708781 is about 379.6228506421.

Subtracting from 54708781 its reverse (18780745), we obtain a square (35928036 = 5994²).

The spelling of 54708781 in words is "fifty-four million, seven hundred eight thousand, seven hundred eighty-one".