1025646678 has 64 divisors (see below), whose sum is σ = 2649024000. Its totient is φ = 288068832.

The previous prime is 1025646673. The next prime is 1025646689. The reversal of 1025646678 is 8766465201.

1025646678 is a `hidden beast` number, since 10 + 2 + 564 + 6 + 6 + 78 = 666.

It is a super-2 number, since 2×1025646678² = 2103902216184871368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025646673) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 693 + ... + 45296.

It is an arithmetic number, because the mean of its divisors is an integer number (41391000).

Almost surely, 2^1025646678 is an apocalyptic number.

1025646678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1025646678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324512000).

1025646678 is an abundant number, since it is smaller than the sum of its proper divisors (1623377322).

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

1025646678 is a wasteful number, since it uses less digits than its factorization.

1025646678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46066 (or 46060 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 1025646678 is about 32025.7190083220. The cubic root of 1025646678 is about 1008.4768329311.

The spelling of 1025646678 in words is "one billion, twenty-five million, six hundred forty-six thousand, six hundred seventy-eight".