781998452 has 12 divisors (see below), whose sum is σ = 1368724896. Its totient is φ = 390934200.

The previous prime is 781998443. The next prime is 781998457. The reversal of 781998452 is 254899187.

It is a super-2 number, since 2×781998452² = 1223043157860792608, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781998394 and 781998403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781998457) 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, 19577 + ... + 44127.

It is an arithmetic number, because the mean of its divisors is an integer number (114060408).

Almost surely, 2^781998452 is an apocalyptic number.

It is an amenable number.

781998452 is a deficient number, since it is larger than the sum of its proper divisors (586726444).

781998452 is a wasteful number, since it uses less digits than its factorization.

781998452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32518 (or 32516 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 53.

The square root of 781998452 is about 27964.2352300219. The cubic root of 781998452 is about 921.3018950004.

The spelling of 781998452 in words is "seven hundred eighty-one million, nine hundred ninety-eight thousand, four hundred fifty-two".