63391890 has 64 divisors (see below), whose sum is σ = 157170816. Its totient is φ = 16353792.

The previous prime is 63391879. The next prime is 63391903. The reversal of 63391890 is 9819336.

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, 202374 + ... + 202686.

It is an arithmetic number, because the mean of its divisors is an integer number (2455794).

Almost surely, 2^63391890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63391890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78585408).

63391890 is an abundant number, since it is smaller than the sum of its proper divisors (93778926).

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

63391890 is a wasteful number, since it uses less digits than its factorization.

63391890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 63391890 is about 7961.9024108563. The cubic root of 63391890 is about 398.7290702877.

The spelling of 63391890 in words is "sixty-three million, three hundred ninety-one thousand, eight hundred ninety".