78152697 has 18 divisors (see below), whose sum is σ = 131318538. Its totient is φ = 44658432.

The previous prime is 78152677. The next prime is 78152729. The reversal of 78152697 is 79625187.

It can be written as a sum of positive squares in only one way, i.e., 67420521 + 10732176 = 8211^2 + 3276^2 .

It is not a de Polignac number, because 78152697 - 2⁸ = 78152441 is a prime.

It is a super-2 number, since 2×78152697² = 12215688096747618, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78152647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 88168 + ... + 89049.

Almost surely, 2^78152697 is an apocalyptic number.

It is an amenable number.

78152697 is a deficient number, since it is larger than the sum of its proper divisors (53165841).

78152697 is a wasteful number, since it uses less digits than its factorization.

78152697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177237 (or 177227 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 78152697 is about 8840.4014049137. The cubic root of 78152697 is about 427.5444993178.

The spelling of 78152697 in words is "seventy-eight million, one hundred fifty-two thousand, six hundred ninety-seven".