80154640 has 20 divisors (see below), whose sum is σ = 186359724. Its totient is φ = 32061824.

The previous prime is 80154619. The next prime is 80154647. The reversal of 80154640 is 4645108.

It can be written as a sum of positive squares in 2 ways, for example, as 58920976 + 21233664 = 7676^2 + 4608^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 80154599 and 80154608.

It is not an unprimeable number, because it can be changed into a prime (80154647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500887 + ... + 501046.

Almost surely, 2^80154640 is an apocalyptic number.

80154640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80154640 is an abundant number, since it is smaller than the sum of its proper divisors (106205084).

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

80154640 is a wasteful number, since it uses less digits than its factorization.

80154640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001946 (or 1001940 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 80154640 is about 8952.9123753112. The cubic root of 80154640 is about 431.1643941259.

Adding to 80154640 its reverse (4645108), we get a palindrome (84799748).

The spelling of 80154640 in words is "eighty million, one hundred fifty-four thousand, six hundred forty".