78738437 has 2 divisors, whose sum is σ = 78738438. Its totient is φ = 78738436.

The previous prime is 78738427. The next prime is 78738469. The reversal of 78738437 is 73483787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74407876 + 4330561 = 8626^2 + 2081^2 .

It is a cyclic number.

It is not a de Polignac number, because 78738437 - 2⁸ = 78738181 is a prime.

It is a super-2 number, since 2×78738437² = 12399482922405938, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78738391 and 78738400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78738427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39369218 + 39369219.

It is an arithmetic number, because the mean of its divisors is an integer number (39369219).

Almost surely, 2^78738437 is an apocalyptic number.

It is an amenable number.

78738437 is a deficient number, since it is larger than the sum of its proper divisors (1).

78738437 is an equidigital number, since it uses as much as digits as its factorization.

78738437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 47.

The square root of 78738437 is about 8873.4681494892. The cubic root of 78738437 is about 428.6099642122.

The spelling of 78738437 in words is "seventy-eight million, seven hundred thirty-eight thousand, four hundred thirty-seven".