3778778549 has 32 divisors (see below), whose sum is σ = 4722955776. Its totient is φ = 2943763200.

The previous prime is 3778778527. The next prime is 3778778551. The reversal of 3778778549 is 9458778773.

It is not a de Polignac number, because 3778778549 - 2¹² = 3778774453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3778778579) 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, 1809584 + ... + 1811670.

It is an arithmetic number, because the mean of its divisors is an integer number (147592368).

Almost surely, 2^3778778549 is an apocalyptic number.

It is an amenable number.

3778778549 is a deficient number, since it is larger than the sum of its proper divisors (944177227).

3778778549 is a wasteful number, since it uses less digits than its factorization.

3778778549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405.

The product of its digits is 82978560, while the sum is 65.

The square root of 3778778549 is about 61471.7703421660. The cubic root of 3778778549 is about 1557.5804247251.

The spelling of 3778778549 in words is "three billion, seven hundred seventy-eight million, seven hundred seventy-eight thousand, five hundred forty-nine".