78190749 has 24 divisors (see below), whose sum is σ = 139007232. Its totient is φ = 41243040.

The previous prime is 78190747. The next prime is 78190759. The reversal of 78190749 is 94709187.

It is not a de Polignac number, because 78190749 - 2¹ = 78190747 is a prime.

It is a super-2 number, since 2×78190749² = 12227586458362002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78190747) 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, 46917 + ... + 48554.

It is an arithmetic number, because the mean of its divisors is an integer number (5791968).

Almost surely, 2^78190749 is an apocalyptic number.

It is an amenable number.

78190749 is a deficient number, since it is larger than the sum of its proper divisors (60816483).

78190749 is a wasteful number, since it uses less digits than its factorization.

78190749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95497 (or 95494 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 78190749 is about 8842.5533077274. The cubic root of 78190749 is about 427.6138775317.

The spelling of 78190749 in words is "seventy-eight million, one hundred ninety thousand, seven hundred forty-nine".