1157157778 has 32 divisors (see below), whose sum is σ = 2034514944. Its totient is φ = 483274512.

The previous prime is 1157157773. The next prime is 1157157791. The reversal of 1157157778 is 8777517511.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1157157773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291201 + ... + 295147.

It is an arithmetic number, because the mean of its divisors is an integer number (63578592).

Almost surely, 2^1157157778 is an apocalyptic number.

1157157778 is a deficient number, since it is larger than the sum of its proper divisors (877357166).

1157157778 is a wasteful number, since it uses less digits than its factorization.

1157157778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4486.

The product of its digits is 480200, while the sum is 49.

The square root of 1157157778 is about 34017.0218861087. The cubic root of 1157157778 is about 1049.8587196155.

The spelling of 1157157778 in words is "one billion, one hundred fifty-seven million, one hundred fifty-seven thousand, seven hundred seventy-eight".