781025490 has 320 divisors, whose sum is σ = 2574291456. Its totient is φ = 166053888.

The previous prime is 781025351. The next prime is 781025491. The reversal of 781025490 is 94520187.

781025490 is a `hidden beast` number, since 7 + 8 + 102 + 549 + 0 = 666.

It is a super-2 number, since 2×781025490² = 1220001632059480200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781025491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 6911674 + ... + 6911786.

Almost surely, 2^781025490 is an apocalyptic number.

781025490 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 781025490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287145728).

781025490 is an abundant number, since it is smaller than the sum of its proper divisors (1793265966).

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

781025490 is a wasteful number, since it uses less digits than its factorization.

781025490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 781025490 is about 27946.8332731993. The cubic root of 781025490 is about 920.9196420037.

The spelling of 781025490 in words is "seven hundred eighty-one million, twenty-five thousand, four hundred ninety".