781396028 has 24 divisors (see below), whose sum is σ = 1563385824. Its totient is φ = 334756800.

The previous prime is 781396027. The next prime is 781396037. The reversal of 781396028 is 820693187.

It is a super-2 number, since 2×781396028² = 1221159505148353568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781396028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781396027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133238 + ... + 138978.

It is an arithmetic number, because the mean of its divisors is an integer number (65141076).

Almost surely, 2^781396028 is an apocalyptic number.

It is an amenable number.

781396028 is an abundant number, since it is smaller than the sum of its proper divisors (781989796).

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

781396028 is a wasteful number, since it uses less digits than its factorization.

781396028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10613 (or 10611 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 781396028 is about 27953.4618249690. The cubic root of 781396028 is about 921.0652547387.

The spelling of 781396028 in words is "seven hundred eighty-one million, three hundred ninety-six thousand, twenty-eight".