1980678790 has 16 divisors (see below), whose sum is σ = 3618435312. Its totient is φ = 780446304.

The previous prime is 1980678767. The next prime is 1980678809. The reversal of 1980678790 is 978760891.

It is a congruent number.

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, 1477449 + ... + 1478788.

It is an arithmetic number, because the mean of its divisors is an integer number (226152207).

Almost surely, 2^1980678790 is an apocalyptic number.

1980678790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1980678790 is a deficient number, since it is larger than the sum of its proper divisors (1637756522).

1980678790 is a wasteful number, since it uses less digits than its factorization.

1980678790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956311.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 1980678790 is about 44504.8176043898. The cubic root of 1980678790 is about 1255.8507144536.

It can be divided in two parts, 19806 and 78790, that added together give a square (98596 = 314²).

The spelling of 1980678790 in words is "one billion, nine hundred eighty million, six hundred seventy-eight thousand, seven hundred ninety".