78132405 has 16 divisors (see below), whose sum is σ = 134628480. Its totient is φ = 38465088.

The previous prime is 78132371. The next prime is 78132407. The reversal of 78132405 is 50423187.

It is not a de Polignac number, because 78132405 - 2²⁶ = 11023541 is a prime.

It is a super-2 number, since 2×78132405² = 12209345422168050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78132407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200145 + ... + 200534.

It is an arithmetic number, because the mean of its divisors is an integer number (8414280).

Almost surely, 2^78132405 is an apocalyptic number.

It is an amenable number.

78132405 is a deficient number, since it is larger than the sum of its proper divisors (56496075).

78132405 is a wasteful number, since it uses less digits than its factorization.

78132405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400700.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 78132405 is about 8839.2536449635. The cubic root of 78132405 is about 427.5074927725.

The spelling of 78132405 in words is "seventy-eight million, one hundred thirty-two thousand, four hundred five".