72690020 has 24 divisors (see below), whose sum is σ = 164391864. Its totient is φ = 26839296.

The previous prime is 72689999. The next prime is 72690047. The reversal of 72690020 is 2009627.

It can be written as a sum of positive squares in 4 ways, for example, as 65536 + 72624484 = 256^2 + 8522^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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 7 ways as a sum of consecutive naturals, for example, 139529 + ... + 140048.

It is an arithmetic number, because the mean of its divisors is an integer number (6849661).

Almost surely, 2^72690020 is an apocalyptic number.

It is an amenable number.

72690020 is an abundant number, since it is smaller than the sum of its proper divisors (91701844).

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

72690020 is a wasteful number, since it uses less digits than its factorization.

72690020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279599 (or 279597 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 72690020 is about 8525.8442397220. The cubic root of 72690020 is about 417.3415225545.

Adding to 72690020 its reverse (2009627), we get a palindrome (74699647).

The spelling of 72690020 in words is "seventy-two million, six hundred ninety thousand, twenty".