1978235633 has 8 divisors (see below), whose sum is σ = 2158586496. Its totient is φ = 1797970000.

The previous prime is 1978235621. The next prime is 1978235657. The reversal of 1978235633 is 3365328791.

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

It is a cyclic number.

It is not a de Polignac number, because 1978235633 - 2¹⁴ = 1978219249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978235933) 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, 33335 + ... + 71187.

It is an arithmetic number, because the mean of its divisors is an integer number (269823312).

Almost surely, 2^1978235633 is an apocalyptic number.

It is an amenable number.

1978235633 is a deficient number, since it is larger than the sum of its proper divisors (180350863).

1978235633 is a wasteful number, since it uses less digits than its factorization.

1978235633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42615.

The product of its digits is 816480, while the sum is 47.

The square root of 1978235633 is about 44477.3609041724. The cubic root of 1978235633 is about 1255.3341402203.

The spelling of 1978235633 in words is "one billion, nine hundred seventy-eight million, two hundred thirty-five thousand, six hundred thirty-three".