248138757 has 6 divisors (see below), whose sum is σ = 358422662. Its totient is φ = 165425832.

The previous prime is 248138747. The next prime is 248138771. The reversal of 248138757 is 757831842.

It can be written as a sum of positive squares in only one way, i.e., 171243396 + 76895361 = 13086^2 + 8769^2 .

It is not a de Polignac number, because 248138757 - 2⁴ = 248138741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248138717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13785478 + ... + 13785495.

Almost surely, 2^248138757 is an apocalyptic number.

It is an amenable number.

248138757 is a deficient number, since it is larger than the sum of its proper divisors (110283905).

248138757 is a wasteful number, since it uses less digits than its factorization.

248138757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27570979 (or 27570976 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 248138757 is about 15752.4206711223. The cubic root of 248138757 is about 628.3932829747.

The spelling of 248138757 in words is "two hundred forty-eight million, one hundred thirty-eight thousand, seven hundred fifty-seven".