1778057145 has 24 divisors (see below), whose sum is σ = 3244176000. Its totient is φ = 898386336.

The previous prime is 1778057093. The next prime is 1778057167. The reversal of 1778057145 is 5417508771.

1778057145 is a `hidden beast` number, since 1 + 7 + 78 + 0 + 571 + 4 + 5 = 666.

It is not a de Polignac number, because 1778057145 - 2⁹ = 1778056633 is a prime.

It is a super-2 number, since 2×1778057145² = 6322974421771102050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1778057145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1038945 + ... + 1040654.

It is an arithmetic number, because the mean of its divisors is an integer number (135174000).

Almost surely, 2^1778057145 is an apocalyptic number.

1778057145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1778057145 is a deficient number, since it is larger than the sum of its proper divisors (1466118855).

1778057145 is a wasteful number, since it uses less digits than its factorization.

1778057145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079629 (or 2079626 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 45.

The square root of 1778057145 is about 42167.0148931603. The cubic root of 1778057145 is about 1211.4771807227.

The spelling of 1778057145 in words is "one billion, seven hundred seventy-eight million, fifty-seven thousand, one hundred forty-five".