78072444 has 48 divisors (see below), whose sum is σ = 213068800. Its totient is φ = 24653808.

The previous prime is 78072439. The next prime is 78072451. The reversal of 78072444 is 44427087.

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 = 78072399 and 78072408.

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, 16972 + ... + 21075.

Almost surely, 2^78072444 is an apocalyptic number.

It is an amenable number.

78072444 is an abundant number, since it is smaller than the sum of its proper divisors (134996356).

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

78072444 is a wasteful number, since it uses less digits than its factorization.

78072444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38079 (or 38071 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 78072444 is about 8835.8612483447. The cubic root of 78072444 is about 427.3981043698.

The spelling of 78072444 in words is "seventy-eight million, seventy-two thousand, four hundred forty-four".