781247952 has 30 divisors (see below), whose sum is σ = 2186409602. Its totient is φ = 260415936.

The previous prime is 781247921. The next prime is 781247953. The reversal of 781247952 is 259742187.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 779749776 + 1498176 = 27924^2 + 1224^2 .

It is a super-2 number, since 2×781247952² = 1220696725008388608, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781247898 and 781247907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781247953) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2712523 + ... + 2712810.

Almost surely, 2^781247952 is an apocalyptic number.

781247952 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

781247952 is an abundant number, since it is smaller than the sum of its proper divisors (1405161650).

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

781247952 is a wasteful number, since it uses less digits than its factorization.

781247952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425347 (or 5425338 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 781247952 is about 27950.8130829856. The cubic root of 781247952 is about 921.0070698704.

The spelling of 781247952 in words is "seven hundred eighty-one million, two hundred forty-seven thousand, nine hundred fifty-two".