212619780 has 72 divisors (see below), whose sum is σ = 648648000. Its totient is φ = 56373312.

The previous prime is 212619779. The next prime is 212619787. The reversal of 212619780 is 87916212.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (212619787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28921 + ... + 35519.

It is an arithmetic number, because the mean of its divisors is an integer number (9009000).

Almost surely, 2^212619780 is an apocalyptic number.

212619780 is a gapful number since it is divisible by the number (20) 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 212619780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324324000).

212619780 is an abundant number, since it is smaller than the sum of its proper divisors (436028220).

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

212619780 is a wasteful number, since it uses less digits than its factorization.

212619780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6793 (or 6788 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 212619780 is about 14581.4875784331. The cubic root of 212619780 is about 596.8536967991.

The spelling of 212619780 in words is "two hundred twelve million, six hundred nineteen thousand, seven hundred eighty".