39920619650 has 48 divisors (see below), whose sum is σ = 76396438440. Its totient is φ = 15510566400.

The previous prime is 39920619623. The next prime is 39920619659. The reversal of 39920619650 is 5691602993.

It can be written as a sum of positive squares in 12 ways, for example, as 823862209 + 39096757441 = 28703^2 + 197729^2 .

It is a super-2 number, since 2×39920619650² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (39920619659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 426932 + ... + 511968.

Almost surely, 2^39920619650 is an apocalyptic number.

39920619650 is a deficient number, since it is larger than the sum of its proper divisors (36475818790).

39920619650 is a wasteful number, since it uses less digits than its factorization.

39920619650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85319 (or 85314 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 50.

The spelling of 39920619650 in words is "thirty-nine billion, nine hundred twenty million, six hundred nineteen thousand, six hundred fifty".