2072156478 has 16 divisors (see below), whose sum is σ = 4736357760. Its totient is φ = 592044696.

The previous prime is 2072156461. The next prime is 2072156479. The reversal of 2072156478 is 8746512702.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 49337059 = 2072156478 / (2 + 0 + 7 + 2 + 1 + 5 + 6 + 4 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2072156479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24668488 + ... + 24668571.

It is an arithmetic number, because the mean of its divisors is an integer number (296022360).

Almost surely, 2^2072156478 is an apocalyptic number.

2072156478 is an abundant number, since it is smaller than the sum of its proper divisors (2664201282).

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

2072156478 is a wasteful number, since it uses less digits than its factorization.

2072156478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49337071.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 2072156478 is about 45520.9454866658. The cubic root of 2072156478 is about 1274.8943094244.

The spelling of 2072156478 in words is "two billion, seventy-two million, one hundred fifty-six thousand, four hundred seventy-eight".