72487733778428 has 12 divisors (see below), whose sum is σ = 126865600535520. Its totient is φ = 36240419339712.

The previous prime is 72487733778371. The next prime is 72487733778457. The reversal of 72487733778428 is 82487733778427.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861840068 + ... + 861924171.

It is an arithmetic number, because the mean of its divisors is an integer number (10572133377960).

Almost surely, 2^{72487733778428} is an apocalyptic number.

It is an amenable number.

72487733778428 is a deficient number, since it is larger than the sum of its proper divisors (54377866757092).

72487733778428 is a wasteful number, since it uses less digits than its factorization.

72487733778428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723774756 (or 1723774754 counting only the distinct ones).

The product of its digits is 4956585984, while the sum is 77.

Subtracting 72487733778428 from its reverse (82487733778427), we obtain a palindrome (9999999999999).

The spelling of 72487733778428 in words is "seventy-two trillion, four hundred eighty-seven billion, seven hundred thirty-three million, seven hundred seventy-eight thousand, four hundred twenty-eight".