80000640 has 384 divisors, whose sum is σ = 315057600. Its totient is φ = 18579456.

The previous prime is 80000639. The next prime is 80000681. The reversal of 80000640 is 4600008.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1860459 + ... + 1860501.

Almost surely, 2^80000640 is an apocalyptic number.

80000640 is a gapful number since it is divisible by the number (80) 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 80000640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157528800).

80000640 is an abundant number, since it is smaller than the sum of its proper divisors (235056960).

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

80000640 is a wasteful number, since it uses less digits than its factorization.

80000640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 80000640 is about 8944.3076870152. The cubic root of 80000640 is about 430.8880870351. Note that the first 3 decimals are identical.

Adding to 80000640 its reverse (4600008), we get a palindrome (84600648).

The spelling of 80000640 in words is "eighty million, six hundred forty", and thus it is an aban number.