157778313 has 48 divisors (see below), whose sum is σ = 272928768. Its totient is φ = 79279200.

The previous prime is 157778287. The next prime is 157778329. The reversal of 157778313 is 313877751.

It is not a de Polignac number, because 157778313 - 2⁵ = 157778281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157778333) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77770 + ... + 79772.

It is an arithmetic number, because the mean of its divisors is an integer number (5686016).

Almost surely, 2^157778313 is an apocalyptic number.

It is an amenable number.

157778313 is a deficient number, since it is larger than the sum of its proper divisors (115150455).

157778313 is a wasteful number, since it uses less digits than its factorization.

157778313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066 (or 2055 counting only the distinct ones).

The product of its digits is 123480, while the sum is 42.

The square root of 157778313 is about 12560.9837592443. The cubic root of 157778313 is about 540.3590581834.

It can be divided in two parts, 15777 and 8313, that added together give a triangular number (24090 = T₂₁₉).

The spelling of 157778313 in words is "one hundred fifty-seven million, seven hundred seventy-eight thousand, three hundred thirteen".