87644390 has 8 divisors (see below), whose sum is σ = 157759920. Its totient is φ = 35057752.

The previous prime is 87644377. The next prime is 87644399. The reversal of 87644390 is 9344678.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87644399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4382210 + ... + 4382229.

It is an arithmetic number, because the mean of its divisors is an integer number (19719990).

Almost surely, 2^87644390 is an apocalyptic number.

87644390 is a deficient number, since it is larger than the sum of its proper divisors (70115530).

87644390 is a wasteful number, since it uses less digits than its factorization.

87644390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8764446.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 87644390 is about 9361.8582557097. The cubic root of 87644390 is about 444.1960656401.

The spelling of 87644390 in words is "eighty-seven million, six hundred forty-four thousand, three hundred ninety".