69947780 has 96 divisors (see below), whose sum is σ = 176504832. Its totient is φ = 22780800.

The previous prime is 69947777. The next prime is 69947789. The reversal of 69947780 is 8774996.

69947780 = 1090² + 1091² + ... + 1145².

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (69947789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308027 + ... + 308253.

It is an arithmetic number, because the mean of its divisors is an integer number (1838592).

Almost surely, 2^69947780 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 69947780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88252416).

69947780 is an abundant number, since it is smaller than the sum of its proper divisors (106557052).

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

69947780 is a wasteful number, since it uses less digits than its factorization.

69947780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 69947780 is about 8363.4789412062. The cubic root of 69947780 is about 412.0260218585.

The spelling of 69947780 in words is "sixty-nine million, nine hundred forty-seven thousand, seven hundred eighty".