78003997 has 8 divisors (see below), whose sum is σ = 81437400. Its totient is φ = 74620224.

The previous prime is 78003977. The next prime is 78004001. The reversal of 78003997 is 79930087.

It can be written as a sum of positive squares in 4 ways, for example, as 32387481 + 45616516 = 5691^2 + 6754^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78003997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78003907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9178 + ... + 15499.

It is an arithmetic number, because the mean of its divisors is an integer number (10179675).

Almost surely, 2^78003997 is an apocalyptic number.

It is an amenable number.

78003997 is a deficient number, since it is larger than the sum of its proper divisors (3433403).

78003997 is a wasteful number, since it uses less digits than its factorization.

78003997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24815.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 78003997 is about 8831.9871489943. The cubic root of 78003997 is about 427.2731662574.

The spelling of 78003997 in words is "seventy-eight million, three thousand, nine hundred ninety-seven".