48138781 has 8 divisors (see below), whose sum is σ = 51689664. Its totient is φ = 44667840.

The previous prime is 48138767. The next prime is 48138803. The reversal of 48138781 is 18783184.

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

It is not a de Polignac number, because 48138781 - 2¹¹ = 48136733 is a prime.

It is a super-2 number, since 2×48138781² = 4634684472331922, 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 (48135781) 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, 18735 + ... + 21148.

It is an arithmetic number, because the mean of its divisors is an integer number (6461208).

Almost surely, 2^48138781 is an apocalyptic number.

It is an amenable number.

48138781 is a deficient number, since it is larger than the sum of its proper divisors (3550883).

48138781 is a wasteful number, since it uses less digits than its factorization.

48138781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39971.

The product of its digits is 43008, while the sum is 40.

The square root of 48138781 is about 6938.2116571924. The cubic root of 48138781 is about 363.7740340673.

The spelling of 48138781 in words is "forty-eight million, one hundred thirty-eight thousand, seven hundred eighty-one".