72686450 has 12 divisors (see below), whose sum is σ = 135196890. Its totient is φ = 29074560.

The previous prime is 72686443. The next prime is 72686473. The reversal of 72686450 is 5468627.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 34703881 + 37982569 = 5891^2 + 6163^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 726815 + ... + 726914.

Almost surely, 2^72686450 is an apocalyptic number.

72686450 is a deficient number, since it is larger than the sum of its proper divisors (62510440).

72686450 is a wasteful number, since it uses less digits than its factorization.

72686450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453741 (or 1453736 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 72686450 is about 8525.6348737205. The cubic root of 72686450 is about 417.3346901924.

The spelling of 72686450 in words is "seventy-two million, six hundred eighty-six thousand, four hundred fifty".