34778872381 has 4 divisors (see below), whose sum is σ = 37940588064. Its totient is φ = 31617156700.

The previous prime is 34778872343. The next prime is 34778872393. The reversal of 34778872381 is 18327887743.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18327887743 = 11 ⋅1666171613.

It is a cyclic number.

It is not a de Polignac number, because 34778872381 - 2²³ = 34770483773 is a prime.

It is a super-2 number, since 2×34778872381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34778872301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1580857825 + ... + 1580857846.

It is an arithmetic number, because the mean of its divisors is an integer number (9485147016).

Almost surely, 2^34778872381 is an apocalyptic number.

It is an amenable number.

34778872381 is a deficient number, since it is larger than the sum of its proper divisors (3161715683).

34778872381 is a wasteful number, since it uses less digits than its factorization.

34778872381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161715682.

The product of its digits is 12644352, while the sum is 58.

The spelling of 34778872381 in words is "thirty-four billion, seven hundred seventy-eight million, eight hundred seventy-two thousand, three hundred eighty-one".