78138007 has 6 divisors (see below), whose sum is σ = 79488368. Its totient is φ = 76810212.

The previous prime is 78137993. The next prime is 78138019. The reversal of 78138007 is 70083187.

It is a happy number.

It is not a de Polignac number, because 78138007 - 2¹⁵ = 78105239 is a prime.

It is a super-2 number, since 2×78138007² = 12211096275864098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78138037) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7743 + ... + 14704.

Almost surely, 2^78138007 is an apocalyptic number.

78138007 is a deficient number, since it is larger than the sum of its proper divisors (1350361).

78138007 is an equidigital number, since it uses as much as digits as its factorization.

78138007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22565 (or 22506 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 78138007 is about 8839.5705212414. The cubic root of 78138007 is about 427.5177097870.

The spelling of 78138007 in words is "seventy-eight million, one hundred thirty-eight thousand, seven".