63402781 has 8 divisors (see below), whose sum is σ = 70482944. Its totient is φ = 56637360.

The previous prime is 63402751. The next prime is 63402797. The reversal of 63402781 is 18720436.

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

It is not a de Polignac number, because 63402781 - 2¹⁹ = 62878493 is a prime.

It is a super-2 number, since 2×63402781² = 8039825277067922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63402701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78261 + ... + 79066.

It is an arithmetic number, because the mean of its divisors is an integer number (8810368).

Almost surely, 2^63402781 is an apocalyptic number.

It is an amenable number.

63402781 is a deficient number, since it is larger than the sum of its proper divisors (7080163).

63402781 is a wasteful number, since it uses less digits than its factorization.

63402781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157371.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 63402781 is about 7962.5863260627. The cubic root of 63402781 is about 398.7519034379.

The spelling of 63402781 in words is "sixty-three million, four hundred two thousand, seven hundred eighty-one".