78437975 has 36 divisors (see below), whose sum is σ = 123449688. Its totient is φ = 48888000.

The previous prime is 78437959. The next prime is 78437987. The reversal of 78437975 is 57973487.

It is not a de Polignac number, because 78437975 - 2⁴ = 78437959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10565 + ... + 16385.

It is an arithmetic number, because the mean of its divisors is an integer number (3429158).

Almost surely, 2^78437975 is an apocalyptic number.

78437975 is a deficient number, since it is larger than the sum of its proper divisors (45011713).

78437975 is a wasteful number, since it uses less digits than its factorization.

78437975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856 (or 5844 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 50.

The square root of 78437975 is about 8856.5216083968. The cubic root of 78437975 is about 428.0640844298.

The spelling of 78437975 in words is "seventy-eight million, four hundred thirty-seven thousand, nine hundred seventy-five".