78266776 has 64 divisors (see below), whose sum is σ = 186969600. Its totient is φ = 29901312.

The previous prime is 78266767. The next prime is 78266777. The reversal of 78266776 is 67766287.

It is a super-2 number, since 2×78266776² = 12251376450868352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78266777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15925 + ... + 20251.

It is an arithmetic number, because the mean of its divisors is an integer number (2921400).

Almost surely, 2^78266776 is an apocalyptic number.

78266776 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78266776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93484800).

78266776 is an abundant number, since it is smaller than the sum of its proper divisors (108702824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78266776 is a wasteful number, since it uses less digits than its factorization.

78266776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4376 (or 4372 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 49.

The square root of 78266776 is about 8846.8511912431. The cubic root of 78266776 is about 427.7524261857.

The spelling of 78266776 in words is "seventy-eight million, two hundred sixty-six thousand, seven hundred seventy-six".