78672137 has 4 divisors (see below), whose sum is σ = 79846416. Its totient is φ = 77497860.

The previous prime is 78672133. The next prime is 78672163. The reversal of 78672137 is 73127687.

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: 73127687 = 2393 ⋅30559.

It is a cyclic number.

It is not a de Polignac number, because 78672137 - 2² = 78672133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78672094 and 78672103.

It is not an unprimeable number, because it can be changed into a prime (78672133) 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, 587039 + ... + 587172.

It is an arithmetic number, because the mean of its divisors is an integer number (19961604).

Almost surely, 2^78672137 is an apocalyptic number.

It is an amenable number.

78672137 is a deficient number, since it is larger than the sum of its proper divisors (1174279).

78672137 is a wasteful number, since it uses less digits than its factorization.

78672137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174278.

The product of its digits is 98784, while the sum is 41.

The square root of 78672137 is about 8869.7315066466. The cubic root of 78672137 is about 428.4896298436.

The spelling of 78672137 in words is "seventy-eight million, six hundred seventy-two thousand, one hundred thirty-seven".