97720907 has 4 divisors (see below), whose sum is σ = 99179496. Its totient is φ = 96262320.

The previous prime is 97720873. The next prime is 97720957. The reversal of 97720907 is 70902779.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97720907 - 2²⁴ = 80943691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97720957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729194 + ... + 729327.

It is an arithmetic number, because the mean of its divisors is an integer number (24794874).

Almost surely, 2^97720907 is an apocalyptic number.

97720907 is a deficient number, since it is larger than the sum of its proper divisors (1458589).

97720907 is a wasteful number, since it uses less digits than its factorization.

97720907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458588.

The product of its (nonzero) digits is 55566, while the sum is 41.

The square root of 97720907 is about 9885.3885609014. The cubic root of 97720907 is about 460.6055462365.

The spelling of 97720907 in words is "ninety-seven million, seven hundred twenty thousand, nine hundred seven".