78943557 has 24 divisors (see below), whose sum is σ = 133576992. Its totient is φ = 41008800.

The previous prime is 78943523. The next prime is 78943591. The reversal of 78943557 is 75534987.

It is an interprime number because it is at equal distance from previous prime (78943523) and next prime (78943591).

It is not a de Polignac number, because 78943557 - 2⁶ = 78943493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78943507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22794 + ... + 26027.

It is an arithmetic number, because the mean of its divisors is an integer number (5565708).

Almost surely, 2^78943557 is an apocalyptic number.

78943557 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

78943557 is a deficient number, since it is larger than the sum of its proper divisors (54633435).

78943557 is a wasteful number, since it uses less digits than its factorization.

78943557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48849 (or 48842 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 48.

The square root of 78943557 is about 8885.0186831542. The cubic root of 78943557 is about 428.9818293661.

The spelling of 78943557 in words is "seventy-eight million, nine hundred forty-three thousand, five hundred fifty-seven".