69690731 has 16 divisors (see below), whose sum is σ = 77756928. Its totient is φ = 61927200.

The previous prime is 69690679. The next prime is 69690739. The reversal of 69690731 is 13709696.

69690731 = T₁₄₈₁ + T₁₄₈₂ + ... + T₁₅₄₁.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-69690731 is a prime.

It is a super-2 number, since 2×69690731² = 9713595974628722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69690739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189710 + ... + 190076.

It is an arithmetic number, because the mean of its divisors is an integer number (4859808).

Almost surely, 2^69690731 is an apocalyptic number.

69690731 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

69690731 is a deficient number, since it is larger than the sum of its proper divisors (8066197).

69690731 is a wasteful number, since it uses less digits than its factorization.

69690731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 69690731 is about 8348.0974479219. The cubic root of 69690731 is about 411.5206883147.

The spelling of 69690731 in words is "sixty-nine million, six hundred ninety thousand, seven hundred thirty-one".