80136240 has 80 divisors (see below), whose sum is σ = 256459776. Its totient is φ = 20678400.

The previous prime is 80136227. The next prime is 80136247. The reversal of 80136240 is 4263108.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×80136240² = 12843633922675200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 80136240.

It is not an unprimeable number, because it can be changed into a prime (80136247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2055 + ... + 12825.

Almost surely, 2^80136240 is an apocalyptic number.

80136240 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 80136240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128229888).

80136240 is an abundant number, since it is smaller than the sum of its proper divisors (176323536).

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

80136240 is a wasteful number, since it uses less digits than its factorization.

80136240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10818 (or 10812 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 80136240 is about 8951.8847177564. The cubic root of 80136240 is about 431.1313994381.

Adding to 80136240 its reverse (4263108), we get a palindrome (84399348).

The spelling of 80136240 in words is "eighty million, one hundred thirty-six thousand, two hundred forty".