781240432 has 20 divisors (see below), whose sum is σ = 1729889776. Its totient is φ = 334817280.

The previous prime is 781240409. The next prime is 781240441. The reversal of 781240432 is 234042187.

It is a super-2 number, since 2×781240432² = 1220673225183093248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781240394 and 781240403.

It is a congruent number.

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, 3487569 + ... + 3487792.

Almost surely, 2^781240432 is an apocalyptic number.

It is an amenable number.

781240432 is an abundant number, since it is smaller than the sum of its proper divisors (948649344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

781240432 is a wasteful number, since it uses less digits than its factorization.

781240432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6975376 (or 6975370 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 781240432 is about 27950.6785606361. The cubic root of 781240432 is about 921.0041147713.

The spelling of 781240432 in words is "seven hundred eighty-one million, two hundred forty thousand, four hundred thirty-two".