248781978 has 24 divisors (see below), whose sum is σ = 570735828. Its totient is φ = 78049152.

The previous prime is 248781943. The next prime is 248782049. The reversal of 248781978 is 879187842.

It is a happy number.

248781978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 217946169 + 30835809 = 14763^2 + 5553^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406201 + ... + 406812.

Almost surely, 2^248781978 is an apocalyptic number.

248781978 is an abundant number, since it is smaller than the sum of its proper divisors (321953850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

248781978 is a wasteful number, since it uses less digits than its factorization.

248781978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813038 (or 813035 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The square root of 248781978 is about 15772.8240337614. The cubic root of 248781978 is about 628.9357845614.

The spelling of 248781978 in words is "two hundred forty-eight million, seven hundred eighty-one thousand, nine hundred seventy-eight".