1978579633 has 8 divisors (see below), whose sum is σ = 2040300288. Its totient is φ = 1917676704.

The previous prime is 1978579571. The next prime is 1978579643. The reversal of 1978579633 is 3369758791.

It is a happy number.

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

It is not a de Polignac number, because 1978579633 - 2⁹ = 1978579121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978579643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199516 + ... + 209197.

It is an arithmetic number, because the mean of its divisors is an integer number (255037536).

Almost surely, 2^1978579633 is an apocalyptic number.

It is an amenable number.

1978579633 is a deficient number, since it is larger than the sum of its proper divisors (61720655).

1978579633 is a wasteful number, since it uses less digits than its factorization.

1978579633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408863.

The product of its digits is 8573040, while the sum is 58.

The square root of 1978579633 is about 44481.2278719911. The cubic root of 1978579633 is about 1255.4069003285.

The spelling of 1978579633 in words is "one billion, nine hundred seventy-eight million, five hundred seventy-nine thousand, six hundred thirty-three".