978779355 has 32 divisors (see below), whose sum is σ = 1598667840. Its totient is φ = 511180800.

The previous prime is 978779353. The next prime is 978779359. The reversal of 978779355 is 553977879.

It is not a de Polignac number, because 978779355 - 2¹ = 978779353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (978779353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 610555 + ... + 612155.

It is an arithmetic number, because the mean of its divisors is an integer number (49958370).

Almost surely, 2^978779355 is an apocalyptic number.

978779355 is a deficient number, since it is larger than the sum of its proper divisors (619888485).

978779355 is a wasteful number, since it uses less digits than its factorization.

978779355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431.

The product of its digits is 16669800, while the sum is 60.

The square root of 978779355 is about 31285.4495732441. The cubic root of 978779355 is about 992.8758182276.

The spelling of 978779355 in words is "nine hundred seventy-eight million, seven hundred seventy-nine thousand, three hundred fifty-five".