78430644 has 36 divisors (see below), whose sum is σ = 206877216. Its totient is φ = 25006608.

The previous prime is 78430643. The next prime is 78430657. The reversal of 78430644 is 44603487.

78430644 is a `hidden beast` number, since 7 + 8 + 4 + 3 + 0 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 78430599 and 78430608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78430643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46534 + ... + 48189.

Almost surely, 2^78430644 is an apocalyptic number.

It is an amenable number.

78430644 is an abundant number, since it is smaller than the sum of its proper divisors (128446572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78430644 is a wasteful number, since it uses less digits than its factorization.

78430644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94756 (or 94751 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 78430644 is about 8856.1077229221. The cubic root of 78430644 is about 428.0507480513.

The spelling of 78430644 in words is "seventy-eight million, four hundred thirty thousand, six hundred forty-four".