61690307 has 4 divisors (see below), whose sum is σ = 70503216. Its totient is φ = 52877400.

The previous prime is 61690303. The next prime is 61690313. The reversal of 61690307 is 70309616.

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 61690307 - 2² = 61690303 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (61690303) 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, 4406444 + ... + 4406457.

It is an arithmetic number, because the mean of its divisors is an integer number (17625804).

Almost surely, 2^61690307 is an apocalyptic number.

61690307 is a deficient number, since it is larger than the sum of its proper divisors (8812909).

61690307 is an equidigital number, since it uses as much as digits as its factorization.

61690307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8812908.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 61690307 is about 7854.3177297586. The cubic root of 61690307 is about 395.1290653384.

The spelling of 61690307 in words is "sixty-one million, six hundred ninety thousand, three hundred seven".