781032106 has 4 divisors (see below), whose sum is σ = 1171548162. Its totient is φ = 390516052.

The previous prime is 781032101. The next prime is 781032127. The reversal of 781032106 is 601230187.

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

It can be written as a sum of positive squares in only one way, i.e., 483780025 + 297252081 = 21995^2 + 17241^2 .

It is a super-2 number, since 2×781032106² = 1220022301205590472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781032101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195258025 + ... + 195258028.

Almost surely, 2^781032106 is an apocalyptic number.

781032106 is a deficient number, since it is larger than the sum of its proper divisors (390516056).

781032106 is a wasteful number, since it uses less digits than its factorization.

781032106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390516055.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 781032106 is about 27946.9516405636. The cubic root of 781032106 is about 920.9222423402.

The spelling of 781032106 in words is "seven hundred eighty-one million, thirty-two thousand, one hundred six".