61693990 has 8 divisors (see below), whose sum is σ = 111049200. Its totient is φ = 24677592.

The previous prime is 61693943. The next prime is 61693993. The reversal of 61693990 is 9939616.

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

It is a super-2 number, since 2×61693990² = 7612296804240200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61693993) 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, 3084690 + ... + 3084709.

It is an arithmetic number, because the mean of its divisors is an integer number (13881150).

Almost surely, 2^61693990 is an apocalyptic number.

61693990 is a deficient number, since it is larger than the sum of its proper divisors (49355210).

61693990 is a wasteful number, since it uses less digits than its factorization.

61693990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6169406.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 61693990 is about 7854.5521832884. The cubic root of 61693990 is about 395.1369284397.

The spelling of 61693990 in words is "sixty-one million, six hundred ninety-three thousand, nine hundred ninety".