78148009 has 6 divisors (see below), whose sum is σ = 80102270. Its totient is φ = 76240320.

The previous prime is 78148003. The next prime is 78148019. The reversal of 78148009 is 90084187.

It can be written as a sum of positive squares in 3 ways, for example, as 3705625 + 74442384 = 1925^2 + 8628^2 .

It is not a de Polignac number, because 78148009 - 2⁵ = 78147977 is a prime.

It is a super-2 number, since 2×78148009² = 12214222621328162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78148003) 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, 21564 + ... + 24925.

Almost surely, 2^78148009 is an apocalyptic number.

It is an amenable number.

78148009 is a deficient number, since it is larger than the sum of its proper divisors (1954261).

78148009 is an equidigital number, since it uses as much as digits as its factorization.

78148009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46571 (or 46530 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 78148009 is about 8840.1362546060. The cubic root of 78148009 is about 427.5359503755.

The spelling of 78148009 in words is "seventy-eight million, one hundred forty-eight thousand, nine".