2078531978 has 4 divisors (see below), whose sum is σ = 3117797970. Its totient is φ = 1039265988.

The previous prime is 2078531977. The next prime is 2078531981. The reversal of 2078531978 is 8791358702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1385105089 + 693426889 = 37217^2 + 26333^2 .

It is a super-3 number, since 3×2078531978³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2078531977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519632993 + ... + 519632996.

Almost surely, 2^2078531978 is an apocalyptic number.

2078531978 is a deficient number, since it is larger than the sum of its proper divisors (1039265992).

2078531978 is a wasteful number, since it uses less digits than its factorization.

2078531978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039265991.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 2078531978 is about 45590.9199073675. The cubic root of 2078531978 is about 1276.2004795830.

The spelling of 2078531978 in words is "two billion, seventy-eight million, five hundred thirty-one thousand, nine hundred seventy-eight".