354778721 has 8 divisors (see below), whose sum is σ = 400377600. Its totient is φ = 311404240.

The previous prime is 354778673. The next prime is 354778727. The reversal of 354778721 is 127877453.

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 354778721 - 2¹⁰ = 354777697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (354778727) 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, 555761 + ... + 556398.

It is an arithmetic number, because the mean of its divisors is an integer number (50047200).

Almost surely, 2^354778721 is an apocalyptic number.

It is an amenable number.

354778721 is a deficient number, since it is larger than the sum of its proper divisors (45598879).

354778721 is a wasteful number, since it uses less digits than its factorization.

354778721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112199.

The product of its digits is 329280, while the sum is 44.

The square root of 354778721 is about 18835.5706311224. The cubic root of 354778721 is about 707.9227262265.

The spelling of 354778721 in words is "three hundred fifty-four million, seven hundred seventy-eight thousand, seven hundred twenty-one".