78477 has 16 divisors (see below), whose sum is σ = 124032. Its totient is φ = 43200.

The previous prime is 78467. The next prime is 78479. The reversal of 78477 is 77487.

It is not a de Polignac number, because 78477 - 2¹² = 74381 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 78477.

It is not an unprimeable number, because it can be changed into a prime (78479) 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, 727 + ... + 827.

It is an arithmetic number, because the mean of its divisors is an integer number (7752).

2⁷⁸⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

78477 is a deficient number, since it is larger than the sum of its proper divisors (45555).

78477 is a wasteful number, since it uses less digits than its factorization.

78477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148.

The product of its digits is 10976, while the sum is 33.

The square root of 78477 is about 280.1374662554. The cubic root of 78477 is about 42.8135063787.

Subtracting from 78477 its reverse (77487), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 784 and 77, that added together give a triangular number (861 = T₄₁).

The spelling of 78477 in words is "seventy-eight thousand, four hundred seventy-seven".