78331497 has 4 divisors (see below), whose sum is σ = 104442000. Its totient is φ = 52220996.

The previous prime is 78331489. The next prime is 78331567. The reversal of 78331497 is 79413387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79413387 = 3 ⋅26471129.

It is a cyclic number.

It is not a de Polignac number, because 78331497 - 2³ = 78331489 is a prime.

It is a super-2 number, since 2×78331497² = 12271646844522018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78331417) 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, 13055247 + ... + 13055252.

It is an arithmetic number, because the mean of its divisors is an integer number (26110500).

Almost surely, 2^78331497 is an apocalyptic number.

It is an amenable number.

78331497 is a deficient number, since it is larger than the sum of its proper divisors (26110503).

78331497 is a wasteful number, since it uses less digits than its factorization.

78331497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26110502.

The product of its digits is 127008, while the sum is 42.

The square root of 78331497 is about 8850.5082904882. The cubic root of 78331497 is about 427.8703005408.

The spelling of 78331497 in words is "seventy-eight million, three hundred thirty-one thousand, four hundred ninety-seven".