78878511 has 12 divisors (see below), whose sum is σ = 114142600. Its totient is φ = 52490160.

The previous prime is 78878509. The next prime is 78878599. The reversal of 78878511 is 11587887.

It is not a de Polignac number, because 78878511 - 2¹ = 78878509 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 (78874511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2536 + ... + 12813.

Almost surely, 2^78878511 is an apocalyptic number.

78878511 is a deficient number, since it is larger than the sum of its proper divisors (35264089).

78878511 is a wasteful number, since it uses less digits than its factorization.

78878511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15926 (or 15923 counting only the distinct ones).

The product of its digits is 125440, while the sum is 45.

The square root of 78878511 is about 8881.3574975901. The cubic root of 78878511 is about 428.8639763058.

The spelling of 78878511 in words is "seventy-eight million, eight hundred seventy-eight thousand, five hundred eleven".