72877555577828 has 12 divisors (see below), whose sum is σ = 127689565116540. Its totient is φ = 36394822687392.

The previous prime is 72877555577791. The next prime is 72877555577831. The reversal of 72877555577828 is 82877555577827.

It can be written as a sum of positive squares in 2 ways, for example, as 58347721090624 + 14529834487204 = 7638568^2 + 3811802^2 .

It is a super-2 number, since 2×72877555577828² (a number of 29 digits) contains 22 as substring.

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, 10988771651 + ... + 10988778282.

It is an arithmetic number, because the mean of its divisors is an integer number (10640797093045).

Almost surely, 2^{72877555577828} is an apocalyptic number.

It is an amenable number.

72877555577828 is a deficient number, since it is larger than the sum of its proper divisors (54812009538712).

72877555577828 is a wasteful number, since it uses less digits than its factorization.

72877555577828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21977550766 (or 21977550764 counting only the distinct ones).

The product of its digits is 21512960000, while the sum is 83.

Subtracting 72877555577828 from its reverse (82877555577827), we obtain a palindrome (9999999999999).

The spelling of 72877555577828 in words is "seventy-two trillion, eight hundred seventy-seven billion, five hundred fifty-five million, five hundred seventy-seven thousand, eight hundred twenty-eight".