78133787 has 8 divisors (see below), whose sum is σ = 80049216. Its totient is φ = 76228992.

The previous prime is 78133739. The next prime is 78133799. The reversal of 78133787 is 78733187.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78133787 is a prime.

It is a super-2 number, since 2×78133787² = 12209777341922738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78133487) 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, 13373 + ... + 18305.

It is an arithmetic number, because the mean of its divisors is an integer number (10006152).

Almost surely, 2^78133787 is an apocalyptic number.

78133787 is a deficient number, since it is larger than the sum of its proper divisors (1915429).

78133787 is a wasteful number, since it uses less digits than its factorization.

78133787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5317.

The product of its digits is 197568, while the sum is 44.

The square root of 78133787 is about 8839.3318186388. The cubic root of 78133787 is about 427.5100133309.

The spelling of 78133787 in words is "seventy-eight million, one hundred thirty-three thousand, seven hundred eighty-seven".