72780236486 has 4 divisors (see below), whose sum is σ = 109170354732. Its totient is φ = 36390118242.

The previous prime is 72780236447. The next prime is 72780236489. The reversal of 72780236486 is 68463208727.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68463208727 = 23 ⋅2976661249.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72780236489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18195059120 + ... + 18195059123.

It is an arithmetic number, because the mean of its divisors is an integer number (27292588683).

Almost surely, 2^72780236486 is an apocalyptic number.

72780236486 is a deficient number, since it is larger than the sum of its proper divisors (36390118246).

72780236486 is a wasteful number, since it uses less digits than its factorization.

72780236486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36390118245.

The product of its (nonzero) digits is 5419008, while the sum is 53.

The spelling of 72780236486 in words is "seventy-two billion, seven hundred eighty million, two hundred thirty-six thousand, four hundred eighty-six".