77887843272 has 48 divisors (see below), whose sum is σ = 218759071440. Its totient is φ = 25962613776.

The previous prime is 77887843183. The next prime is 77887843273. The reversal of 77887843272 is 27234878877.

It is a super-2 number, since 2×77887843272² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77887843273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20030938 + ... + 20034825.

It is an arithmetic number, because the mean of its divisors is an integer number (4557480655).

Almost surely, 2^77887843272 is an apocalyptic number.

77887843272 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

77887843272 is an abundant number, since it is smaller than the sum of its proper divisors (140871228168).

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

77887843272 is a wasteful number, since it uses less digits than its factorization.

77887843272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40065784 (or 40065768 counting only the distinct ones).

The product of its digits is 59006976, while the sum is 63.

The spelling of 77887843272 in words is "seventy-seven billion, eight hundred eighty-seven million, eight hundred forty-three thousand, two hundred seventy-two".