7213978134 has 72 divisors (see below), whose sum is σ = 17644929120. Its totient is φ = 2126947680.

The previous prime is 7213978127. The next prime is 7213978153. The reversal of 7213978134 is 4318793127.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7213978134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35827 + ... + 125345.

It is an arithmetic number, because the mean of its divisors is an integer number (245068460).

Almost surely, 2^7213978134 is an apocalyptic number.

7213978134 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7213978134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8822464560).

7213978134 is an abundant number, since it is smaller than the sum of its proper divisors (10430950986).

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

7213978134 is a wasteful number, since it uses less digits than its factorization.

7213978134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89586 (or 89572 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 7213978134 is about 84935.1407486913. The cubic root of 7213978134 is about 1932.2275669728.

The spelling of 7213978134 in words is "seven billion, two hundred thirteen million, nine hundred seventy-eight thousand, one hundred thirty-four".