78638337 has 16 divisors (see below), whose sum is σ = 117636480. Its totient is φ = 51914736.

The previous prime is 78638303. The next prime is 78638347. The reversal of 78638337 is 73383687.

78638337 is a `hidden beast` number, since 7 + 8 + 638 + 3 + 3 + 7 = 666.

It is not a de Polignac number, because 78638337 - 2¹⁴ = 78621953 is a prime.

It is a super-2 number, since 2×78638337² = 12367976092251138, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78638292 and 78638301.

It is not an unprimeable number, because it can be changed into a prime (78638347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11358 + ... + 16919.

It is an arithmetic number, because the mean of its divisors is an integer number (7352280).

Almost surely, 2^78638337 is an apocalyptic number.

It is an amenable number.

78638337 is a deficient number, since it is larger than the sum of its proper divisors (38998143).

78638337 is a wasteful number, since it uses less digits than its factorization.

78638337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28389 (or 28383 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 78638337 is about 8867.8259455179. The cubic root of 78638337 is about 428.4282568906.

The spelling of 78638337 in words is "seventy-eight million, six hundred thirty-eight thousand, three hundred thirty-seven".