77970993 has 32 divisors (see below), whose sum is σ = 113778432. Its totient is φ = 47308800.

The previous prime is 77970967. The next prime is 77971039. The reversal of 77970993 is 39907977.

It is not a de Polignac number, because 77970993 - 2⁵ = 77970961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (77970913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220705 + ... + 221057.

It is an arithmetic number, because the mean of its divisors is an integer number (3555576).

Almost surely, 2^77970993 is an apocalyptic number.

It is an amenable number.

77970993 is a deficient number, since it is larger than the sum of its proper divisors (35807439).

77970993 is a wasteful number, since it uses less digits than its factorization.

77970993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505.

The product of its (nonzero) digits is 750141, while the sum is 51.

The square root of 77970993 is about 8830.1185156259. The cubic root of 77970993 is about 427.2128970685.

The spelling of 77970993 in words is "seventy-seven million, nine hundred seventy thousand, nine hundred ninety-three".