781352428 has 12 divisors (see below), whose sum is σ = 1439333560. Its totient is φ = 370114272.

The previous prime is 781352417. The next prime is 781352443. The reversal of 781352428 is 824253187.

It is a happy number.

It is a super-2 number, since 2×781352428² = 1221023233482990368, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5140401 + ... + 5140552.

Almost surely, 2^781352428 is an apocalyptic number.

It is an amenable number.

781352428 is a deficient number, since it is larger than the sum of its proper divisors (657981132).

781352428 is a wasteful number, since it uses less digits than its factorization.

781352428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10280976 (or 10280974 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The square root of 781352428 is about 27952.6819464609. The cubic root of 781352428 is about 921.0481233522.

The spelling of 781352428 in words is "seven hundred eighty-one million, three hundred fifty-two thousand, four hundred twenty-eight".