63990739 has 8 divisors (see below), whose sum is σ = 64790000. Its totient is φ = 63195552.

The previous prime is 63990721. The next prime is 63990757. The reversal of 63990739 is 93709936.

63990739 = T₆₅₃₀ + T₆₅₃₁ + T₆₅₃₂.

It is an interprime number because it is at equal distance from previous prime (63990721) and next prime (63990757).

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

It is a cyclic number.

It is not a de Polignac number, because 63990739 - 2⁷ = 63990611 is a prime.

It is a super-2 number, since 2×63990739² = 8189629355532242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63990799) 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, 40537 + ... + 42085.

It is an arithmetic number, because the mean of its divisors is an integer number (8098750).

Almost surely, 2^63990739 is an apocalyptic number.

63990739 is the 6532-nd centered triangular number.

63990739 is a deficient number, since it is larger than the sum of its proper divisors (799261).

63990739 is a wasteful number, since it uses less digits than its factorization.

63990739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037.

The product of its (nonzero) digits is 275562, while the sum is 46.

The square root of 63990739 is about 7999.4211665595. The cubic root of 63990739 is about 399.9807053193.

It can be divided in two parts, 639 and 90739, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 63990739 in words is "sixty-three million, nine hundred ninety thousand, seven hundred thirty-nine".