78109497 has 6 divisors (see below), whose sum is σ = 112824842. Its totient is φ = 52072992.

The previous prime is 78109483. The next prime is 78109501. The reversal of 78109497 is 79490187.

It can be written as a sum of positive squares in only one way, i.e., 61168041 + 16941456 = 7821^2 + 4116^2 .

It is not a de Polignac number, because 78109497 - 2⁴ = 78109481 is a prime.

It is a super-2 number, since 2×78109497² = 12202187043186018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78109417) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4339408 + ... + 4339425.

Almost surely, 2^78109497 is an apocalyptic number.

It is an amenable number.

78109497 is a deficient number, since it is larger than the sum of its proper divisors (34715345).

78109497 is a wasteful number, since it uses less digits than its factorization.

78109497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8678839 (or 8678836 counting only the distinct ones).

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

The square root of 78109497 is about 8837.9577392065. The cubic root of 78109497 is about 427.4657077243.

It can be divided in two parts, 78109 and 497, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 78109497 in words is "seventy-eight million, one hundred nine thousand, four hundred ninety-seven".