6865190640 has 400 divisors, whose sum is σ = 29729525760. Its totient is φ = 1426429440.

The previous prime is 6865190639. The next prime is 6865190663. The reversal of 6865190640 is 460915686.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 492081 + ... + 505839.

Almost surely, 2^6865190640 is an apocalyptic number.

6865190640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6865190640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14864762880).

6865190640 is an abundant number, since it is smaller than the sum of its proper divisors (22864335120).

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

6865190640 is a wasteful number, since it uses less digits than its factorization.

6865190640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13802 (or 13787 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 6865190640 is about 82856.4459773650. The cubic root of 6865190640 is about 1900.5714476883.

The spelling of 6865190640 in words is "six billion, eight hundred sixty-five million, one hundred ninety thousand, six hundred forty".