1278055998 has 48 divisors (see below), whose sum is σ = 2853513936. Its totient is φ = 413112960.

The previous prime is 1278055967. The next prime is 1278056029. The reversal of 1278055998 is 8995508721.

1278055998 is a `hidden beast` number, since 1 + 2 + 7 + 80 + 559 + 9 + 8 = 666.

1278055998 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1278055967) and next prime (1278056029).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 205393 + ... + 211523.

It is an arithmetic number, because the mean of its divisors is an integer number (59448207).

Almost surely, 2^1278055998 is an apocalyptic number.

1278055998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278055998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426756968).

1278055998 is an abundant number, since it is smaller than the sum of its proper divisors (1575457938).

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

1278055998 is a wasteful number, since it uses less digits than its factorization.

1278055998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6489 (or 6486 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 54.

The square root of 1278055998 is about 35749.9090628214. The cubic root of 1278055998 is about 1085.2170979993.

The spelling of 1278055998 in words is "one billion, two hundred seventy-eight million, fifty-five thousand, nine hundred ninety-eight".