54536781 has 32 divisors (see below), whose sum is σ = 82001920. Its totient is φ = 32011200.

The previous prime is 54536777. The next prime is 54536809. The reversal of 54536781 is 18763545.

It is not a de Polignac number, because 54536781 - 2² = 54536777 is a prime.

It is a super-2 number, since 2×54536781² = 5948520963683922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54536281) 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, 95226 + ... + 95796.

It is an arithmetic number, because the mean of its divisors is an integer number (2562560).

Almost surely, 2^54536781 is an apocalyptic number.

It is an amenable number.

54536781 is a deficient number, since it is larger than the sum of its proper divisors (27465139).

54536781 is a wasteful number, since it uses less digits than its factorization.

54536781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697.

The product of its digits is 100800, while the sum is 39.

The square root of 54536781 is about 7384.9022336115. The cubic root of 54536781 is about 379.2245984394.

The spelling of 54536781 in words is "fifty-four million, five hundred thirty-six thousand, seven hundred eighty-one".