78578707451 has 4 divisors (see below), whose sum is σ = 78579886992. Its totient is φ = 78577527912.

The previous prime is 78578707447. The next prime is 78578707463. The reversal of 78578707451 is 15470787587.

It is a happy number.

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 78578707451 - 2² = 78578707447 is a prime.

It is a super-2 number, since 2×78578707451² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78578787451) 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, 483455 + ... + 625208.

It is an arithmetic number, because the mean of its divisors is an integer number (19644971748).

Almost surely, 2^78578707451 is an apocalyptic number.

78578707451 is a deficient number, since it is larger than the sum of its proper divisors (1179541).

78578707451 is a wasteful number, since it uses less digits than its factorization.

78578707451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179540.

The product of its (nonzero) digits is 15366400, while the sum is 59.

The spelling of 78578707451 in words is "seventy-eight billion, five hundred seventy-eight million, seven hundred seven thousand, four hundred fifty-one".