157678765 has 4 divisors (see below), whose sum is σ = 189214524. Its totient is φ = 126143008.

The previous prime is 157678753. The next prime is 157678783. The reversal of 157678765 is 567876751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 121462441 + 36216324 = 11021^2 + 6018^2 .

It is a cyclic number.

It is not a de Polignac number, because 157678765 - 2⁵ = 157678733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 15767872 + ... + 15767881.

It is an arithmetic number, because the mean of its divisors is an integer number (47303631).

Almost surely, 2^157678765 is an apocalyptic number.

It is an amenable number.

157678765 is a deficient number, since it is larger than the sum of its proper divisors (31535759).

157678765 is an equidigital number, since it uses as much as digits as its factorization.

157678765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31535758.

The product of its digits is 2469600, while the sum is 52.

The square root of 157678765 is about 12557.0205462920. The cubic root of 157678765 is about 540.2453903002.

The spelling of 157678765 in words is "one hundred fifty-seven million, six hundred seventy-eight thousand, seven hundred sixty-five".