1682797978 has 8 divisors (see below), whose sum is σ = 2528064468. Its totient is φ = 840109824.

The previous prime is 1682797969. The next prime is 1682797979. The reversal of 1682797978 is 8797972861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1650228129 + 32569849 = 40623^2 + 5707^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×1682797978³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1682797979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642951 + ... + 645562.

Almost surely, 2^1682797978 is an apocalyptic number.

1682797978 is a deficient number, since it is larger than the sum of its proper divisors (845266490).

1682797978 is a wasteful number, since it uses less digits than its factorization.

1682797978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289168.

The product of its digits is 21337344, while the sum is 64.

The square root of 1682797978 is about 41021.9207010106. The cubic root of 1682797978 is about 1189.4439833558.

The spelling of 1682797978 in words is "one billion, six hundred eighty-two million, seven hundred ninety-seven thousand, nine hundred seventy-eight".