1248555820 has 24 divisors (see below), whose sum is σ = 2776201344. Its totient is φ = 470044416.

The previous prime is 1248555811. The next prime is 1248555863. The reversal of 1248555820 is 285558421.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1835772 + ... + 1836451.

It is an arithmetic number, because the mean of its divisors is an integer number (115675056).

Almost surely, 2^1248555820 is an apocalyptic number.

1248555820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1248555820 is an abundant number, since it is smaller than the sum of its proper divisors (1527645524).

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

1248555820 is a wasteful number, since it uses less digits than its factorization.

1248555820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672249 (or 3672247 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 40.

The square root of 1248555820 is about 35334.9093673664. The cubic root of 1248555820 is about 1076.8023329489.

The spelling of 1248555820 in words is "one billion, two hundred forty-eight million, five hundred fifty-five thousand, eight hundred twenty".