78356497 has 4 divisors (see below), whose sum is σ = 78412096. Its totient is φ = 78300900.

The previous prime is 78356489. The next prime is 78356501. The reversal of 78356497 is 79465387.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 78356497 - 2³ = 78356489 is a prime.

It is a super-2 number, since 2×78356497² = 12279481244222018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78356497.

It is not an unprimeable number, because it can be changed into a prime (78356407) 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, 25629 + ... + 28522.

It is an arithmetic number, because the mean of its divisors is an integer number (19603024).

Almost surely, 2^78356497 is an apocalyptic number.

It is an amenable number.

78356497 is a deficient number, since it is larger than the sum of its proper divisors (55599).

78356497 is a wasteful number, since it uses less digits than its factorization.

78356497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55598.

The product of its digits is 1270080, while the sum is 49.

The square root of 78356497 is about 8851.9205260779. The cubic root of 78356497 is about 427.9158148832.

The spelling of 78356497 in words is "seventy-eight million, three hundred fifty-six thousand, four hundred ninety-seven".