78620138 has 24 divisors (see below), whose sum is σ = 131887200. Its totient is φ = 35045568.

The previous prime is 78620111. The next prime is 78620159. The reversal of 78620138 is 83102687.

It is a super-2 number, since 2×78620138² = 12362252198278088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78620098 and 78620107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7403 + ... + 14561.

It is an arithmetic number, because the mean of its divisors is an integer number (5495300).

Almost surely, 2^78620138 is an apocalyptic number.

78620138 is a deficient number, since it is larger than the sum of its proper divisors (53267062).

78620138 is a wasteful number, since it uses less digits than its factorization.

78620138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7214 (or 7197 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 78620138 is about 8866.7997609058. The cubic root of 78620138 is about 428.3952044479.

The spelling of 78620138 in words is "seventy-eight million, six hundred twenty thousand, one hundred thirty-eight".