78227700 has 72 divisors (see below), whose sum is σ = 228547872. Its totient is φ = 20657280.

The previous prime is 78227689. The next prime is 78227711. The reversal of 78227700 is 772287.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78227689) and next prime (78227711).

It is a super-2 number, since 2×78227700² = 12239146094580000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 30882 + ... + 33318.

It is an arithmetic number, because the mean of its divisors is an integer number (3174276).

Almost surely, 2^78227700 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78227700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114273936).

78227700 is an abundant number, since it is smaller than the sum of its proper divisors (150320172).

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

78227700 is a wasteful number, since it uses less digits than its factorization.

78227700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561 (or 2554 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 78227700 is about 8844.6424461365. The cubic root of 78227700 is about 427.6812268120.

Adding to 78227700 its reverse (772287), we get a palindrome (78999987).

It can be divided in two parts, 782 and 27700, that added together give a palindrome (28482).

The spelling of 78227700 in words is "seventy-eight million, two hundred twenty-seven thousand, seven hundred".