3642778557 has 24 divisors (see below), whose sum is σ = 5742030528. Its totient is φ = 2207016000.

The previous prime is 3642778519. The next prime is 3642778567. The reversal of 3642778557 is 7558772463.

It is a happy number.

3642778557 is a `hidden beast` number, since 3 + 64 + 27 + 7 + 8 + 557 = 666.

3642778557 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3642778557 - 2⁷ = 3642778429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3642778507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 571128 + ... + 577470.

It is an arithmetic number, because the mean of its divisors is an integer number (239251272).

Almost surely, 2^3642778557 is an apocalyptic number.

It is an amenable number.

3642778557 is a deficient number, since it is larger than the sum of its proper divisors (2099251971).

3642778557 is a wasteful number, since it uses less digits than its factorization.

3642778557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12161 (or 12158 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 54.

The square root of 3642778557 is about 60355.4351902130. The cubic root of 3642778557 is about 1538.6656453386.

The spelling of 3642778557 in words is "three billion, six hundred forty-two million, seven hundred seventy-eight thousand, five hundred fifty-seven".