351776778 has 16 divisors (see below), whose sum is σ = 726249216. Its totient is φ = 113476320.

The previous prime is 351776771. The next prime is 351776807. The reversal of 351776778 is 877677153.

It is a happy number.

It is a super-2 number, since 2×351776778² = 247493803080122568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 351776778.

It is not an unprimeable number, because it can be changed into a prime (351776771) 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, 945451 + ... + 945822.

It is an arithmetic number, because the mean of its divisors is an integer number (45390576).

Almost surely, 2^351776778 is an apocalyptic number.

351776778 is an abundant number, since it is smaller than the sum of its proper divisors (374472438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

351776778 is a wasteful number, since it uses less digits than its factorization.

351776778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891309.

The product of its digits is 1728720, while the sum is 51.

The square root of 351776778 is about 18755.7132095796. The cubic root of 351776778 is about 705.9203833424.

The spelling of 351776778 in words is "three hundred fifty-one million, seven hundred seventy-six thousand, seven hundred seventy-eight".