78493837 has 4 divisors (see below), whose sum is σ = 79599456. Its totient is φ = 77388220.

The previous prime is 78493823. The next prime is 78493853. The reversal of 78493837 is 73839487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78493837 is a prime.

It is a super-2 number, since 2×78493837² = 12322564893965138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78493537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552703 + ... + 552844.

It is an arithmetic number, because the mean of its divisors is an integer number (19899864).

Almost surely, 2^78493837 is an apocalyptic number.

It is an amenable number.

78493837 is a deficient number, since it is larger than the sum of its proper divisors (1105619).

78493837 is a wasteful number, since it uses less digits than its factorization.

78493837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105618.

The product of its digits is 1016064, while the sum is 49.

The square root of 78493837 is about 8859.6747682971. The cubic root of 78493837 is about 428.1656799536.

The spelling of 78493837 in words is "seventy-eight million, four hundred ninety-three thousand, eight hundred thirty-seven".