1978133624 has 32 divisors (see below), whose sum is σ = 3917020800. Its totient is φ = 933936480.

The previous prime is 1978133593. The next prime is 1978133629. The reversal of 1978133624 is 4263318791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978133629) 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, 25469 + ... + 67859.

It is an arithmetic number, because the mean of its divisors is an integer number (122406900).

Almost surely, 2^1978133624 is an apocalyptic number.

It is an amenable number.

1978133624 is a deficient number, since it is larger than the sum of its proper divisors (1938887176).

1978133624 is a wasteful number, since it uses less digits than its factorization.

1978133624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42723 (or 42719 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 1978133624 is about 44476.2141374465. The cubic root of 1978133624 is about 1255.3125624771.

The spelling of 1978133624 in words is "one billion, nine hundred seventy-eight million, one hundred thirty-three thousand, six hundred twenty-four".