78337638 has 16 divisors (see below), whose sum is σ = 174083760. Its totient is φ = 26112528.

The previous prime is 78337631. The next prime is 78337643. The reversal of 78337638 is 83673387.

78337638 is a `hidden beast` number, since 7 + 8 + 3 + 3 + 7 + 638 = 666.

It is a super-2 number, since 2×78337638² = 12273571054838088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78337593 and 78337602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78337631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725295 + ... + 725402.

It is an arithmetic number, because the mean of its divisors is an integer number (10880235).

Almost surely, 2^78337638 is an apocalyptic number.

78337638 is an abundant number, since it is smaller than the sum of its proper divisors (95746122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78337638 is a wasteful number, since it uses less digits than its factorization.

78337638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450708 (or 1450702 counting only the distinct ones).

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

The square root of 78337638 is about 8850.8552129159. The cubic root of 78337638 is about 427.8814815810.

The spelling of 78337638 in words is "seventy-eight million, three hundred thirty-seven thousand, six hundred thirty-eight".