78252997 has 4 divisors (see below), whose sum is σ = 78685516. Its totient is φ = 77820480.

The previous prime is 78252973. The next prime is 78253003. The reversal of 78252997 is 79925287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5764801 + 72488196 = 2401^2 + 8514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78252997 is a prime.

It is a super-2 number, since 2×78252997² = 12247063078964018, 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 78252997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78252947) 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, 215988 + ... + 216349.

It is an arithmetic number, because the mean of its divisors is an integer number (19671379).

Almost surely, 2^78252997 is an apocalyptic number.

It is an amenable number.

78252997 is a deficient number, since it is larger than the sum of its proper divisors (432519).

78252997 is a wasteful number, since it uses less digits than its factorization.

78252997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432518.

The product of its digits is 635040, while the sum is 49.

The square root of 78252997 is about 8846.0724053107. The cubic root of 78252997 is about 427.7273225300.

The spelling of 78252997 in words is "seventy-eight million, two hundred fifty-two thousand, nine hundred ninety-seven".