63209970 has 80 divisors (see below), whose sum is σ = 172454040. Its totient is φ = 16609536.

The previous prime is 63209963. The next prime is 63209977. The reversal of 63209970 is 7990236.

It is an interprime number because it is at equal distance from previous prime (63209963) and next prime (63209977).

It can be written as a sum of positive squares in 4 ways, for example, as 51451929 + 11758041 = 7173^2 + 3429^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63209977) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 58596 + ... + 59664.

Almost surely, 2^63209970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63209970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86227020).

63209970 is an abundant number, since it is smaller than the sum of its proper divisors (109244070).

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

63209970 is a wasteful number, since it uses less digits than its factorization.

63209970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 63209970 is about 7950.4697974396. The cubic root of 63209970 is about 398.3472849036.

It can be divided in two parts, 6320 and 9970, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 63209970 in words is "sixty-three million, two hundred nine thousand, nine hundred seventy".