78272949920 has 48 divisors (see below), whose sum is σ = 201730743648. Its totient is φ = 28462890240.

The previous prime is 78272949913. The next prime is 78272949973. The reversal of 78272949920 is 2994927287.

It is a super-2 number, since 2×78272949920² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78272949920.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22234874 + ... + 22238393.

It is an arithmetic number, because the mean of its divisors is an integer number (4202723826).

Almost surely, 2^78272949920 is an apocalyptic number.

It is an amenable number.

78272949920 is an abundant number, since it is smaller than the sum of its proper divisors (123457793728).

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

78272949920 is a wasteful number, since it uses less digits than its factorization.

78272949920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44473293 (or 44473285 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 78272949920 in words is "seventy-eight billion, two hundred seventy-two million, nine hundred forty-nine thousand, nine hundred twenty".