78211569420 has 72 divisors (see below), whose sum is σ = 237867935760. Its totient is φ = 20801370240.

The previous prime is 78211569409. The next prime is 78211569421. The reversal of 78211569420 is 2496511287.

78211569420 is a `hidden beast` number, since 7 + 8 + 211 + 5 + 6 + 9 + 420 = 666.

It is a super-2 number, since 2×78211569420² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (78211569421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 505011 + ... + 641450.

It is an arithmetic number, because the mean of its divisors is an integer number (3303721330).

Almost surely, 2^78211569420 is an apocalyptic number.

It is an amenable number.

78211569420 is an abundant number, since it is smaller than the sum of its proper divisors (159656366340).

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

78211569420 is a wasteful number, since it uses less digits than its factorization.

78211569420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146855 (or 1146850 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 78211569420 in words is "seventy-eight billion, two hundred eleven million, five hundred sixty-nine thousand, four hundred twenty".