157678449 has 4 divisors (see below), whose sum is σ = 210237936. Its totient is φ = 105118964.

The previous prime is 157678441. The next prime is 157678453. The reversal of 157678449 is 944876751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157678449 - 2³ = 157678441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157678441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26279739 + ... + 26279744.

It is an arithmetic number, because the mean of its divisors is an integer number (52559484).

Almost surely, 2^157678449 is an apocalyptic number.

It is an amenable number.

157678449 is a deficient number, since it is larger than the sum of its proper divisors (52559487).

157678449 is an equidigital number, since it uses as much as digits as its factorization.

157678449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52559486.

The product of its digits is 1693440, while the sum is 51.

The square root of 157678449 is about 12557.0079636831. The cubic root of 157678449 is about 540.2450294027.

The spelling of 157678449 in words is "one hundred fifty-seven million, six hundred seventy-eight thousand, four hundred forty-nine".