1257870078 has 24 divisors (see below), whose sum is σ = 2791859616. Its totient is φ = 409063200.

The previous prime is 1257870073. The next prime is 1257870139. The reversal of 1257870078 is 8700787521.

1257870078 is a `hidden beast` number, since 1 + 2 + 578 + 7 + 0 + 0 + 78 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257870073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 851478 + ... + 852953.

It is an arithmetic number, because the mean of its divisors is an integer number (116327484).

Almost surely, 2^1257870078 is an apocalyptic number.

1257870078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1257870078 is an abundant number, since it is smaller than the sum of its proper divisors (1533989538).

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

1257870078 is a wasteful number, since it uses less digits than its factorization.

1257870078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704480 (or 1704477 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 45.

The square root of 1257870078 is about 35466.4641316272. The cubic root of 1257870078 is about 1079.4733594911.

The spelling of 1257870078 in words is "one billion, two hundred fifty-seven million, eight hundred seventy thousand, seventy-eight".