83897640 has 128 divisors (see below), whose sum is σ = 282268800. Its totient is φ = 22164480.

The previous prime is 83897617. The next prime is 83897651. The reversal of 83897640 is 4679838.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141184 + ... + 141776.

It is an arithmetic number, because the mean of its divisors is an integer number (2205225).

Almost surely, 2^83897640 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 83897640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141134400).

83897640 is an abundant number, since it is smaller than the sum of its proper divisors (198371160).

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

83897640 is a wasteful number, since it uses less digits than its factorization.

83897640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 83897640 is about 9159.5654918779. The cubic root of 83897640 is about 437.7739497853.

The spelling of 83897640 in words is "eighty-three million, eight hundred ninety-seven thousand, six hundred forty".