78247007 has 4 divisors (see below), whose sum is σ = 80771136. Its totient is φ = 75722880.

The previous prime is 78247003. The next prime is 78247033. The reversal of 78247007 is 70074287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70074287 = 359 ⋅195193.

It is a cyclic number.

It is not a de Polignac number, because 78247007 - 2² = 78247003 is a prime.

It is a super-2 number, since 2×78247007² = 12245188208916098, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78247003) 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, 1262018 + ... + 1262079.

It is an arithmetic number, because the mean of its divisors is an integer number (20192784).

Almost surely, 2^78247007 is an apocalyptic number.

78247007 is a deficient number, since it is larger than the sum of its proper divisors (2524129).

78247007 is a wasteful number, since it uses less digits than its factorization.

78247007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524128.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 78247007 is about 8845.7338304970. The cubic root of 78247007 is about 427.7164085624.

The spelling of 78247007 in words is "seventy-eight million, two hundred forty-seven thousand, seven".