71620040 has 16 divisors (see below), whose sum is σ = 161145180. Its totient is φ = 28648000.

The previous prime is 71620037. The next prime is 71620061. The reversal of 71620040 is 4002617.

It can be written as a sum of positive squares in 2 ways, for example, as 70324996 + 1295044 = 8386^2 + 1138^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 71619994 and 71620021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895211 + ... + 895290.

Almost surely, 2^71620040 is an apocalyptic number.

It is an amenable number.

71620040 is an abundant number, since it is smaller than the sum of its proper divisors (89525140).

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

71620040 is a wasteful number, since it uses less digits than its factorization.

71620040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790512 (or 1790508 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 71620040 is about 8462.8623999212. The cubic root of 71620040 is about 415.2836692200.

Adding to 71620040 its reverse (4002617), we get a palindrome (75622657).

The spelling of 71620040 in words is "seventy-one million, six hundred twenty thousand, forty".