69720949 has 6 divisors (see below), whose sum is σ = 70926230. Its totient is φ = 68535816.

The previous prime is 69720947. The next prime is 69720967. The reversal of 69720949 is 94902796.

It can be written as a sum of positive squares in only one way, i.e., 52664049 + 17056900 = 7257^2 + 4130^2 .

It is not a de Polignac number, because 69720949 - 2¹ = 69720947 is a prime.

It is a super-2 number, since 2×69720949² = 9722021458921202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 69720899 and 69720908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69720943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6534 + ... + 13495.

Almost surely, 2^69720949 is an apocalyptic number.

It is an amenable number.

69720949 is a deficient number, since it is larger than the sum of its proper divisors (1205281).

69720949 is an equidigital number, since it uses as much as digits as its factorization.

69720949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20147 (or 20088 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 69720949 is about 8349.9071252320. The cubic root of 69720949 is about 411.5801583718.

The spelling of 69720949 in words is "sixty-nine million, seven hundred twenty thousand, nine hundred forty-nine".