642796377 has 16 divisors (see below), whose sum is σ = 895918080. Its totient is φ = 409453200.

The previous prime is 642796369. The next prime is 642796411. The reversal of 642796377 is 773697246.

It is a happy number.

It is not a de Polignac number, because 642796377 - 2³ = 642796369 is a prime.

It is a super-2 number, since 2×642796377² = 826374364568652258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642796307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36399 + ... + 51092.

It is an arithmetic number, because the mean of its divisors is an integer number (55994880).

Almost surely, 2^642796377 is an apocalyptic number.

It is an amenable number.

642796377 is a deficient number, since it is larger than the sum of its proper divisors (253121703).

642796377 is a wasteful number, since it uses less digits than its factorization.

642796377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87604.

The product of its digits is 2667168, while the sum is 51.

The square root of 642796377 is about 25353.4292946733. The cubic root of 642796377 is about 863.0271798313.

The spelling of 642796377 in words is "six hundred forty-two million, seven hundred ninety-six thousand, three hundred seventy-seven".