781334072 has 16 divisors (see below), whose sum is σ = 1465353240. Its totient is φ = 390573216.

The previous prime is 781334053. The next prime is 781334077. The reversal of 781334072 is 270433187.

It is a super-2 number, since 2×781334072² = 1220965864136202368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781334077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34283 + ... + 52325.

Almost surely, 2^781334072 is an apocalyptic number.

It is an amenable number.

781334072 is a deficient number, since it is larger than the sum of its proper divisors (684019168).

781334072 is a wasteful number, since it uses less digits than its factorization.

781334072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23462 (or 23458 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 781334072 is about 27952.3536039454. The cubic root of 781334072 is about 921.0409106907.

The spelling of 781334072 in words is "seven hundred eighty-one million, three hundred thirty-four thousand, seventy-two".