78157007 has 4 divisors (see below), whose sum is σ = 82754496. Its totient is φ = 73559520.

The previous prime is 78156997. The next prime is 78157031. The reversal of 78157007 is 70075187.

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

It is a cyclic number.

It is not a de Polignac number, because 78157007 - 2¹² = 78152911 is a prime.

It is a super-2 number, since 2×78157007² = 12217035486396098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78157207) 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 3 ways as a sum of consecutive naturals, for example, 2298719 + ... + 2298752.

It is an arithmetic number, because the mean of its divisors is an integer number (20688624).

Almost surely, 2^78157007 is an apocalyptic number.

78157007 is a deficient number, since it is larger than the sum of its proper divisors (4597489).

78157007 is a wasteful number, since it uses less digits than its factorization.

78157007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597488.

The product of its (nonzero) digits is 13720, while the sum is 35.

The square root of 78157007 is about 8840.6451687646. The cubic root of 78157007 is about 427.5523586452.

The spelling of 78157007 in words is "seventy-eight million, one hundred fifty-seven thousand, seven".