781058157 has 16 divisors (see below), whose sum is σ = 1136581632. Its totient is φ = 473161520.

The previous prime is 781058143. The next prime is 781058177. The reversal of 781058157 is 751850187.

It is a cyclic number.

It is not a de Polignac number, because 781058157 - 2⁴ = 781058141 is a prime.

It is a super-2 number, since 2×781058157² = 1220103689232473298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781058177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108958 + ... + 115904.

It is an arithmetic number, because the mean of its divisors is an integer number (71036352).

Almost surely, 2^781058157 is an apocalyptic number.

It is an amenable number.

781058157 is a deficient number, since it is larger than the sum of its proper divisors (355523475).

781058157 is a wasteful number, since it uses less digits than its factorization.

781058157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10368.

The product of its (nonzero) digits is 78400, while the sum is 42.

The square root of 781058157 is about 27947.4177161326. The cubic root of 781058157 is about 920.9324812187.

The spelling of 781058157 in words is "seven hundred eighty-one million, fifty-eight thousand, one hundred fifty-seven".