78135837 has 8 divisors (see below), whose sum is σ = 112195104. Its totient is φ = 48083568.

The previous prime is 78135821. The next prime is 78135839. The reversal of 78135837 is 73853187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78135837 - 2⁴ = 78135821 is a prime.

It is a super-2 number, since 2×78135837² = 12210418047381138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78135839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001703 + ... + 1001780.

It is an arithmetic number, because the mean of its divisors is an integer number (14024388).

Almost surely, 2^78135837 is an apocalyptic number.

It is an amenable number.

78135837 is a deficient number, since it is larger than the sum of its proper divisors (34059267).

78135837 is a wasteful number, since it uses less digits than its factorization.

78135837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003499.

The product of its digits is 141120, while the sum is 42.

The square root of 78135837 is about 8839.4477768693. The cubic root of 78135837 is about 427.5137521652.

The spelling of 78135837 in words is "seventy-eight million, one hundred thirty-five thousand, eight hundred thirty-seven".