78812405 has 16 divisors (see below), whose sum is σ = 111008640. Its totient is φ = 52581312.

The previous prime is 78812369. The next prime is 78812429. The reversal of 78812405 is 50421887.

It is not a de Polignac number, because 78812405 - 2¹⁶ = 78746869 is a prime.

It is a super-2 number, since 2×78812405² = 12422790363768050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29135 + ... + 31724.

It is an arithmetic number, because the mean of its divisors is an integer number (6938040).

Almost surely, 2^78812405 is an apocalyptic number.

It is an amenable number.

78812405 is a deficient number, since it is larger than the sum of its proper divisors (32196235).

78812405 is a wasteful number, since it uses less digits than its factorization.

78812405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60908.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 78812405 is about 8877.6351017599. The cubic root of 78812405 is about 428.7441362916.

The spelling of 78812405 in words is "seventy-eight million, eight hundred twelve thousand, four hundred five".