1978550285 has 8 divisors (see below), whose sum is σ = 2375792640. Its totient is φ = 1581818704.

The previous prime is 1978550281. The next prime is 1978550333. The reversal of 1978550285 is 5820558791.

It is a happy number.

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 1978550285 - 2² = 1978550281 is a prime.

It is a super-2 number, since 2×1978550285² = 7829322460547162450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978550281) 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, 119117 + ... + 134706.

It is an arithmetic number, because the mean of its divisors is an integer number (296974080).

Almost surely, 2^1978550285 is an apocalyptic number.

It is an amenable number.

1978550285 is a deficient number, since it is larger than the sum of its proper divisors (397242355).

1978550285 is a wasteful number, since it uses less digits than its factorization.

1978550285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255387.

The product of its (nonzero) digits is 1008000, while the sum is 50.

The square root of 1978550285 is about 44480.8979787953. The cubic root of 1978550285 is about 1255.4006932051.

The spelling of 1978550285 in words is "one billion, nine hundred seventy-eight million, five hundred fifty thousand, two hundred eighty-five".