78135974 has 8 divisors (see below), whose sum is σ = 133947408. Its totient is φ = 33486840.

The previous prime is 78135943. The next prime is 78135979. The reversal of 78135974 is 47953187.

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

It is a super-2 number, since 2×78135974² = 12210460865857352, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78135979) 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, 2790557 + ... + 2790584.

It is an arithmetic number, because the mean of its divisors is an integer number (16743426).

Almost surely, 2^78135974 is an apocalyptic number.

78135974 is a deficient number, since it is larger than the sum of its proper divisors (55811434).

78135974 is a wasteful number, since it uses less digits than its factorization.

78135974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5581150.

The product of its digits is 211680, while the sum is 44.

The square root of 78135974 is about 8839.4555262188. The cubic root of 78135974 is about 427.5140020265.

The spelling of 78135974 in words is "seventy-eight million, one hundred thirty-five thousand, nine hundred seventy-four".