30778036957 has 4 divisors (see below), whose sum is σ = 31012983936. Its totient is φ = 30543089980.

The previous prime is 30778036921. The next prime is 30778036981. The reversal of 30778036957 is 75963087703.

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: 75963087703 = 150523 ⋅504661.

It is a cyclic number.

It is not a de Polignac number, because 30778036957 - 2³¹ = 28630553309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30778036898 and 30778036907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30778036357) 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, 117473293 + ... + 117473554.

It is an arithmetic number, because the mean of its divisors is an integer number (7753245984).

Almost surely, 2^30778036957 is an apocalyptic number.

It is an amenable number.

30778036957 is a deficient number, since it is larger than the sum of its proper divisors (234946979).

30778036957 is a wasteful number, since it uses less digits than its factorization.

30778036957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234946978.

The product of its (nonzero) digits is 6667920, while the sum is 55.

The spelling of 30778036957 in words is "thirty billion, seven hundred seventy-eight million, thirty-six thousand, nine hundred fifty-seven".