78354405 has 64 divisors (see below), whose sum is σ = 145566720. Its totient is φ = 39955968.

The previous prime is 78354401. The next prime is 78354413. The reversal of 78354405 is 50445387.

It is not a de Polignac number, because 78354405 - 2² = 78354401 is a prime.

It is a super-2 number, since 2×78354405² = 12278825565808050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78354405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78354401) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 336169 + ... + 336401.

It is an arithmetic number, because the mean of its divisors is an integer number (2274480).

Almost surely, 2^78354405 is an apocalyptic number.

It is an amenable number.

78354405 is a deficient number, since it is larger than the sum of its proper divisors (67212315).

78354405 is a wasteful number, since it uses less digits than its factorization.

78354405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The square root of 78354405 is about 8851.8023588420. The cubic root of 78354405 is about 427.9120066143.

The spelling of 78354405 in words is "seventy-eight million, three hundred fifty-four thousand, four hundred five".