78878231 has 12 divisors (see below), whose sum is σ = 82905264. Its totient is φ = 75028800.

The previous prime is 78878143. The next prime is 78878263. The reversal of 78878231 is 13287887.

It is not a de Polignac number, because 78878231 - 2¹⁰ = 78877207 is a prime.

It is a super-2 number, since 2×78878231² = 12443550651378722, 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 (78878131) 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, 59051 + ... + 60371.

It is an arithmetic number, because the mean of its divisors is an integer number (6908772).

Almost surely, 2^78878231 is an apocalyptic number.

78878231 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

78878231 is a deficient number, since it is larger than the sum of its proper divisors (4027033).

78878231 is a wasteful number, since it uses less digits than its factorization.

78878231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450 (or 1421 counting only the distinct ones).

The product of its digits is 150528, while the sum is 44.

The square root of 78878231 is about 8881.3417342201. The cubic root of 78878231 is about 428.8634688500.

The spelling of 78878231 in words is "seventy-eight million, eight hundred seventy-eight thousand, two hundred thirty-one".